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Crocus
Genus of flowering plants in the family Iridaceae

Crocus is a genus of seasonal flowering plants in the family Iridaceae (iris family) comprising about 100 species of perennials growing from corms. They are low growing plants, whose flower stems remain underground, that bear relatively large white, yellow, orange or purple flowers and then become dormant after flowering. Many are cultivated for their flowers, appearing in autumn, winter, or spring. The flowers close at night and in overcast weather conditions. The crocus has been known throughout recorded history, mainly as the source of saffron. Saffron is obtained from the dried stigma of Crocus sativus, an autumn-blooming species. It is valued as a spice and dyestuff, and is one of the most expensive spices in the world. Iran is the center of saffron production. Crocuses are native to woodland, scrub, and meadows from sea level to alpine tundra from the Mediterranean, through North Africa, central and southern Europe, the islands of the Aegean, the Middle East and across Central Asia to Xinjiang in western China. Crocuses may be propagated from seed or from daughter cormels formed on the corm, that eventually produce mature plants. They arrived in Europe from Turkey in the 16th century and became valued as an ornamental flowering plant.

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Description

General

Crocus display the general characteristics of family Iridaceae, which include basal cauline (arising from the aerial stem) leaves that sheath the stem base, hermaphrodite flowers that are relatively large and showy, the perianth petaloid with two whorls of three tepals each and septal nectaries. The flowers have three stamens and a gynoecium of three united carpels and an inferior ovary, three locules and axile placentation with fruit that is a loculicidal capsule.1

Crocus is an acaulescent (lacking a visible lower stem above ground) diminutive seasonal cormous (growing from corms) herbaceous perennial geophytic genus.2 The corms are symmetrical and globose or oblate (round in shape with flatted tops and bottoms), and are covered with tunic leaves that are fibrous, membranous or coriaceous (leathery). The corms produce fibrous roots, and contractile roots which adjust the corms depth in the soil, which may be pulled as deep as 20 centimetres (8 in) into the soil.34 The roots appear randomly from the lower part of the corm, but in a few species, from a basal ridge.5

Leaves

Plants produce several basal linear bifacial green leaves that arise from the corms. These are adaxially (upper surface facing axis) flat or channelled with pale median stripes, while the opposite (abaxial) surface is strongly keeled, with two grooves on either side. The leaves have a distinctive shape in cross-section, being boat-shaped with two lateral arms with margins recurved inwardly towards the central ridged keel, forming the sides of the "boat". The keel may be square or rectangular, but is lacking in C. carpetanus. The pale central stripe is caused by parenchymatous cells which lack chloroplasts and may contain air spaces.6 The leaves are from 5 to 30 millimetres (3⁄16 to 1+3⁄16 in) wide and 10 to 118 centimetres (4 to 46 in) long. The leaf-like bracts are membranous, while the smaller bracteoles are either membranous or absent.78 The leaf bases are surrounded by up to 5 membranous sheaths called cataphylls, a specialised leaf. The bases of the cataphylls form the corm tunic, and their number varies from 3 to 6, and enclose the true leaves (euphylls), bracts, bracteoles and flowering stalk.910

Flowers

The number of peduncles (flower stems) vary from one to several and remain underground, emerging only at the fruiting stage, bearing flowers that are solitary or several, so that a true scape is absent. The flowers are pedicellate (attached to the peduncle by a short subterranean pedicel stalk). The pedicel is sometimes subtended (below pedicel) by a membranous, sheathing prophyll (leaf-like structure).1112

The showy, salver to cup-shaped, single or clustered actinomorphic flowers taper off into a narrow tube; the flowers emerge from the ground, and can be white, yellow, lilac to dark purple, or variegated in cultivars. The flower tube is long, cylindrical and slender, expanding apically. The floral tube is long and narrow with 6 lobes in 2 whorls. The perianth is 3+3 (3 sepals+3 petals) and gamophyllous (with fused segments). The tepal whorls are similar, equal or subequal with a smaller inner whorl, and cupped to outspread. The bracts are membranous, but the inner ones are sometimes lacking.131415

The 3 stamens are erect and linear and inserted in the throat of the perianth tube, with anthers shorter than the filaments. Pollen grains are inaperturate (apertures absent) but sometimes spiraperturate (spiral shaped).16 Each flower has a single style which is exserted (projecting beyond the corolla tube) and slender distally with three to many branches. The branches are highly variable, being short or long, and simple, bifurcate (dividing in two) or multifid and sometimes distally flattened. The inferior ovary has 3 carpels with axile placentation. It remains underground, and as the seeds ripen, the pedicel (stem of the flower) grows longer so the fruit is above the soil surface.171819

Fruit and seed

The fruit is a small membranous capsule, ellipsoid or oblong-ellipsoid in shape and the many seeds are globose to ellipsoid. The seed surface is highly variable, including papillate (covered in small protuberances), digitiform (finger-like) and other epidermal cell types. In some species the seeds are arillate, with fleshy appendages. Crocus seeds have both inner and outer integuments and in some species the outer epidermis may display long papillae. Embryo-sac development is Polygonum type. Dehiscence (splitting of the capsule to release the seed) is of the loculicidal type in which it splits through the wall of the locules leaving the septa that separate them intact.202122

Karyology

Crocus has extensive aneuploidy (abnormal number of chromosomes), with some uncertainty as to the base number of chromosomes. The chromosome numbers shows extreme variability, ranging from 2n=6 to 2n=70 even within a single species.2324

Phytochemistry

The Iridaceae contain a wide range of phenolic compounds. However, 6-Hydroxyflavones are found only in Crocus, which is also characterised by the presence of crocins, water-soluble yellow carotenoids, in the floral tissues. Crocin is a diester of crocetin, responsible for the colour of the styles and stigma of C. sativus, and hence saffron.2526 A few species contain mangiferin, a glucosylxanthone.2728

While the flowers may vary dramatically between species, there is little variation in the leaves,29 but sufficient variability in corm tunics that they may be used as an aid in differentiating taxa.30

Crocus structuresCorms with net-like papery tunicClosed flower with leavesFlower with 3 stamens surrounding central style and stigma3 stamens and styleCentral stigma in opening flowerExserted style & trifid stigma projecting above corollaLateral viewCapsules (seedpods) with seeds

Taxonomy

History

The crocus was well known to the ancients,31 being described at least as early as Theophrastus (c. 371 – c. 287 BC),3233 and was introduced into Britain by the Romans, where the saffron crocus was used as a dyestuff. It was reintroduced into Western Europe by the Crusaders. The crocus is mentioned in mediaeval and later herbals, one of the earliest being the 14th century Tractatus de Herbis.3435 William Turner (1548) states that the crocus is referred to as saffron in English, implying that only C. sativus was known at that time.36 However, by 1597 John Gerard writes of "sundry sorts" and uses the term saffron and crocus as interchangeable. He included both spring and autumn flowering crocus, but distinguished Wild Saffron (Crocus) from Meadow Saffron (Colchicum). He described eleven forms. Some of his specimens were obtained from Clusius.3738 In the following century, John Parkinson in a more detailed account was more careful to include separate chapters for Colchicum, with the common name of meadow saffron, from Crocus or saffron. Parkinson (1656) states that there are "divers sorts of saffrons" describing 27 spring flowering plants and 4 autumn flowering ones, pointing out that only one of those was the true saffron crocus, which he called Crocus verus sativus autumnalis.39 Similar accounts are found in continental European herbals, including those of l'Obel in Flanders (1576)40 and Besler's Hortus Eystettensis in Bavaria (1613).41

The genus Crocus was first formally described by Linnaeus in 1753, with three taxa, and two species, C. sativus (type species), var. officinalis (now treated as a synonym of C. sativus) and var. vernus (now C. vernus) and C. bulbocodium (now Romulea bulbocodium). Thus Linnaeus recognised two taxa that are accepted as separate species in modern classifications, one vernal and one autumnal crocus, but incorrectly assumed they were only varieties of a single species, while his second species was actually from a closely related genus that was only recognised later (1772).42 However, a subsequent re-examination of Linnaeus's specimens suggested the presence of several different species that he did not recognise as being separate.43 Linnaeus' system, based on sexual characteristics, Crocus was classified as Triandra Monogynia (Three stamens, Single pistil).44 Linnaeus's system was supplanted by the "natural" system which used a hierarchy of taxonomic ranks based on weighting of the importance of structural characteristics of the plant. Jussieu (1789) placed the genus Crocus in his Ordo (family) Irides or Les iris, as a member of the class Stamina epigyna (stamens inserted above the ovary) as part of the monocotyledons, the first level of the division of the flowering plants.45

One of the first monographs of the genus appeared in 1809, by Haworth,46 followed in 1829 by that of Sabine,4748 and Herbert in 1847.49 In 1853, Lindley continued the placement of Crocus as one of 53 genera in Iridaceae, which he included in a higher order of monocotyledons, the Narcissales.50 Baker published a monograph on the genus in 1874, adopting a very different schema to that of Herbert.51 In 1883, Bentham and Hooker described the Irideae (Iridaceae) as having more than 700 species, and divided it into 3 tribes and further into subtribes. Tribe Sysyrinchieae as having 2 subtribes, including Ixieae. The latter was circumscribed with four genera, Crocus, Syringodea, Galaxia (Moraea) and Romulea.52 This circumscription has remained stable since, with the exception of Moraea which properly belongs in a separate tribe. The most influential monograph of the nineteenth century was that of Maw (1886), which forms the basis of modern understanding of the genus. Maw built on the work of Herbert, rejecting Baker's classification.53 The availability of molecular phylogenetic methods in the late twentieth century has shown that the Iridaceae properly belong within the order Asparagales.54

Botanical illustration

The scientific study of the genus in the late eighteenth century was accompanied by detailed descriptions with Botanical illustrations, such as those of William Curtis (1787) and Sims (1803),55 that appeared in Curtis's Botanical Magazine, with illustrations by Sydenham Edwards.56 Other illustrations are found in monographs such as those of Haworth (1809)57 and Sabine (1830), illustrated by Charles John Robertson.58 The largest collection is found in the most comprehensive monograph, that of Maw (1886).59 Other sources include the portfolios of plates, such as the survey of the plants of France by Masclef (1891). At that time only C. sativus and C. vernus were included in the Flora of France.60

Botanical illustrationCrocusCurtis's Botanical Magazine 1787C. angustifoliusCurtis's Botanical Magazine 1803Crocus luteusA Haworth 1809Crocus bouquet of 19 speciesSabine 1830C. iridiflorusMaw 1886

Phylogeny

The genus Crocus belongs to the monocot family Iridaceae (iris family), specifically the large subfamily Crocoideae. Within that subfamily, crocus is placed on the tribe, Ixieae (synonym Croceae),61 one of five. The Ixieae are then subdivided into subtribes, with the genera Crocus, Romulea and Syringodea forming subtribe Romuleinae. The Romuleinae have been characterised within the Ixieae by progressively reduced aerial stems.62 solitary flowers on the stem branches and woody tunics on the corms. They also often have divided style branches. However, Crocus corm tunics are fibrous and membranous rather than woody as in Syringodea. Also, Crocus has a ridged and often keeled abaxial leaf surface, while that of Syringodea is rounded, and the midline adaxial translucency of Crocus is lacking in Syringodea. Romulea is principally distinguished from the other two genera by generally having aerial stems or at least an ovary at ground level, compared with the other acaulescent genera, other differences include unifacial rather than bifacial leaves and the pollen structure.6364

Within the Romuleinae, Crocus is a sister group to Syringodea, the two genera forming a sister group to Romulea.656667

Subdivision

The genus Crocus consists of about 200 accepted species, which continue to increase, and has undergone a large number of taxonomic classifications.68 The genus has often been divided into sections, beginning with that of Haworth (1809)69 who described two sections based on the presence or absence of hairs in the throat of the flower, while Sabine was the first to realise the importance of the presence or absence of a basal spathe (prophyll) in dividing the genus into two sections,70 a practice followed by Herbert.71 However, Sabine's practice of using trinomials for varieties such as C. sulphureus concolor is no longer accepted, although Herbert somewhat similarly used varieties and subvarieties, e.g. C. vernus var.1 Communis subvar. 1. Obovatus. Herbert also used geographical distribution as a basis of classification.72 By the late 19th century Maw (1886),73 following Herbert, subdivided the genus into two divisions, the Involucrati and the Nudiflori, and then further divided it into six sections and lastly by flowering times (spring or autumn). Although rejecting the concept of subvarieties, he placed even more emphasis on geography.74757677

The most widely accepted system, that proposed by Brian Mathew in 198278 was based on Maw's system, but with less emphasis on flowering times. This mainly depended on three character states:

  • the presence or absence of a prophyll (a basal spathe);
  • the aspect of the style;
  • the corm tunic.

and included 81 species, however, one of these, Crocus medius was later recognized as a synonym of Crocus nudiflorus.7980

The genus, as described by Mathew, consisted of two subgenera, Crocirus (monotypic for Crocus banaticus) and Crocus including the remainder of the species, based on whether the anthers were introrse or extrorse (dehiscence directed towards or away from centre of flower) respectively. Subgenus Crocus was then divided into two sections, Crocus and Nudiscapus, based on the presence or absence of the prophyll. Each section was then further divided into six series of Crocus and nine of Nudiscapus. These series were defined by the division of the style, the corm tunic, flowering time, leaf structure, presence of a bracteole and anther colour. Mathew also introduced the concept of subspecies, including 50 in all, by giving similar but different forms subspecies status if geographically separated, resulting in about 140 distinct taxa.81 The seven species and ten subspecies discovered since then have been integrated into revisions of this classification, though new species continue to be described,82838485 leading to estimates of at least 200 species.8687

Speciation

Crocus populations have extremely high infra-specific variability with a very diverse spectrum of morphological and phenotypical varieties, while many individual specimens from different species may closely resemble each other. Based on such morphological differences between isolated populations many new species have been named, but without a definition of new species based on molecular and/or karyological information, species can not be confirmed, creating difficulties in determining speciation and hence the exact number of species.8889 The situation is even more complex once hybridisation (combination of taxa) and introgression (transfer of genetic material) are considered.9091

Molecular phylogeny

The availability of molecular phylogeny methods revealed problems with the traditional systems based on morphology alone. The first analysis of the complete genus was carried out by Mathew and colleagues in 2008 using nucleotide sequences from plastid regions. In particular, the DNA data suggest there are no grounds for isolating C. banaticus in its own subgenus Crociris, though it is a unique species in the genus. Because it has a prophyll at the base of the pedicel, it therefore would fall within section Crocus, although its exact relationship to the rest of the subgenus remains unclear.92

Of the 15 series in the Mathew scheme, only seven were monophyletic, and in particular the largest series, Biflori and Reticulati, which include a third of all species, were non-monophyletic. Another anomalous species, C. baytopiorum, should now be placed in a series of its own, series Baytopi. C. gargaricus subsp. herbertii has been raised to species status, as C. herbertii. The autumn-flowering C. longiflorus, the type species of series Longiflori (long regarded by Mathew as "a disparate assemblage"), appeared to lie within series Verni. In addition, the position of C. malyi was currently unclear.93

DNA analysis and morphological studies suggest further that series Reticulati, Biflori and Speciosi are "probably inseparable", C. adanensis and C. caspius should probably be removed from Biflori, C. adanensis falls in a clade with C. paschei as a sister group to the species of series Flavi and C. caspius appears to be sister to the species of series Orientales.9495

The study showed "no support for a system of sections as currently defined", although, despite the many inconsistencies between Mathew's 1982 classification and the current hypothesis, "the main assignment of species to the sections and series of that system is actually supported". The authors state, "further studies are required before any firm decisions about a hierarchical system of classification can be considered" and conclude "future re-classification is likely to involve all infrageneric levels, subgenera, sections and series".96 A further study, using the internal transcribed spacer region (ITS) of the nuclear ribosomal DNA (rDNA), together with a chloroplast marker, broadly confirmed these findings.97

Crocus forms a monophyletic clade, with a basal polytomy of four subclades. The first clade (A) corresponding to section Crocus, but including C. sieberi and several closely related species (originally included in section Nudiscapus series Reticulati). The remaining three clades (B-D) include all the remaining species of section Nudiscapus. Of these, B and C are small, corresponding to series Orientales and Carpetani respectively, with all remaining series in the large D clade. The exception is C. caspius, originally in series Biflori, which segregates in clade B. Thus, although division of the genus into two sections is well supported, no single morphological character defines these two groups. The C. sieberi group are assumed to have lost their prophyll secondarily. Of the series, eight could be shown to be monophyletic; Crocus, Kotschyani and Scardici (section Crocus) and Aleppici, Carpetani, Laevigati, Orientalis and Speciosi (section Nudiscapus). Flowering season did not correspond to molecular groupings and nor did any of the previously used morphological characteristics, indicating a high degree of homoplasy, in which traits are gained or lost independently in different lineages. The remainder of the series could not be supported as natural groupings. Mathew's concept of subspecies status within C. biflorus could not be supported, each being considered a separate species, resulting in the genus having at least 150 species.98

A more detailed molecular and morphological study of series Verni (section Crocus) allowed it to be better characterised and circumscribed, as well as the closely related series Longiflori. Series Verni sensu Mathew was found to consist of two groups, the first being C. vernus sensu Mathew and the other consisting of C. etruscus, ilvensis, kosaninii and longiflorus. The taxonomic status of C. vernus had been uncertain for some time, given the observation that the name was more properly applied to C. albiflorus,99 requiring a new designation of C. neapolitanus for those previously known as C. vernus. Subsequently C. vernus was split into 5 separate species. The incorporation of C. longiflorus into series Verni resulted in making series Longiflori no longer a legitimate taxonomic unit.100

In section Nudiscapus, series Reticulati was polyphyletic with species intermingled with series Biflori and Speciosi, requiring a recircumscription, confining Reticulati to 8 species, to obtain monophyly.101 Among the thereby displaced species, are a number of very closely related taxa, referred to as the Crocus sieberi aggregate, which has been proposed as a new series Sieberi.102 Other new series, such as Isauri and Lyciotauri, continue to be created out of the Biflori series.103104

Mathew's circumscription of Crocus introduced the rank of subspecies, of which the largest number (14) were those of Crocus biflorus Miller, the type species of series Biflori, a number which continued to grow. Molecular methods identified these as a polyphyletic assemblage rather than closely related subordinate infraspecific taxa. This necessitated a complete taxonomic revision of series Biflori, elevating each subspecies to species status.105 A similar issue occurs with C. reticulatus sensu Mathew, who created two subspecies, resulting in 9 newly defined species.106

Sections and species

Main article: List of Crocus species

The classification of Brian Mathew (1982), as amended in 2009 divides the genus into two sections, further divided by series.107 The number of series, continues to evolve.

  • Section Crocus B.Mathew

Species with a basal prophyll. Type species C. sativus L.

6 series
  • Section Nudiscapus B.Mathew

Species without a basal prophyll. Type species C. reticulatus Stev. ex Adams

9 series

Similarly named species

Some crocus species, known as "autumn crocus", flower in late summer and autumn, during (autumnal) rains, after summer's heat and drought. The name autumn crocus is also often used as a common name for Colchicum,108 which is not a true crocus but in its own family (Colchicaceae) in the lily order Liliales. The plants are toxic, but have medicinal uses. Colchicum are also known as meadow saffron, though true saffron is not toxic.109 Crocus species have three stamens while Colchicum species have six;110 crocus have one style, while Colchicum have three.111112

Some Pulsatilla species are also called "prairie crocus" (previously Anemone patens) or "wild crocus", but they belong to the buttercup family (Ranunculaceae).113114 Pulsatilla species, which are commonly called pasqueflowers, unlike crocuses have rhizomes, the foliage is covered with long soft hairs, and the flowers are produced on above-ground stems.115116

Etymology

"Crocus", the name of the genus, is Late Middle English (late 14th century) and also denotes saffron. It is derived via Latin crocus from the Greek κρόκος (krokos),117 which is itself probably a loan word from a Semitic language, related to Hebrew כרכום karkōm,118 Aramaic ܟܟܘܪܟܟܡܡܐ kurkama, and Arabic كركم kurkum, meaning saffron (Crocus sativus), "saffron yellow" or turmeric (see Curcuma), another yellow dye.119 The word ultimately traces back to the Sanskrit kunkumam (कुङ्कुमं) for "saffron". The English name is a learned 16th-century adoption from the Latin safranum, but Old English already had croh for saffron, introduced by the Romans.120121122

Distribution and habitat

Crocuses are distributed from the Mediterranean, from the Iberian peninsula and North Africa, through central and southern Europe, the islands of the Aegean, the Middle East and across central and southwest Asia to Xinjiang in western China, but most species are restricted to Turkey and Asia Minor and the Balkans, with the Balkan Peninsula having the largest number of species (at least 31),123 forming the centre of diversity, however they are widely introduced.124125126127 The distribution of species is described over five contiguous areas from west to east (see map).128

Distribution map of 16 species of genus Crocus in Europe and Asia

Habitats range from sea level to as high as subalpine altitudes, and in a wide range of habitats from woodlands to meadows and deserts, often on stony mountain slopes with good drainage.129130 The majority of species are native to areas with cold winters and hot summers with little rain, and active growth is typically from fall to mid-spring.131 The natural habitats of crocus species are threatened by human activities, including urbanization, industrialization, and other land disturbances and recreational uses. They are negatively impacted by uncontrolled gathering and heavy grazing by livestock.132

Ecology

The life cycle of Crocus species begins with the seed, germinating to a seedling, and a mature plant in 3–5 years, however seeds may remain dormant in the soil for several years. The germination stages were first described and illustrated by Maw in his 1886 monograph.133 In its first year, the crocus produces only a single leaf and creates a corm covered by a thin tunic, about 5–8 mm in size, dependent on the species. In the northern hemisphere, the autumnal crocuses flower between September and November. The vernal (spring) crocuses flowering time depends both on climate and habitat, but is usually mid-winter to spring. Leaves may be synanthous (produced during flowering) or hysteranthous (when the flowers wither away).134 In the summer, with hot and dry conditions the plant becomes dormant, with all the above ground parts dying back. Colder temperatures in winter then activate the corms.135 Propagation occurs sexually by seed and asexually by small corms, called cormels or cormlets, produced in the axils of the corms (between tunic scales and body of corm).136 As the fruit capsule ripens, it emerges from the soil at the base of the flowering stem before dehiscing (splitting open) and releasing the seeds.137 Seed dispersal may be enhanced by ants, at least in species with arillate seeds.138

At night and in overcast weather, the perianth closes. The ovary produces nectar which attracts bees (particularly female bumblebees) and Lepidoptera.139140

Pests and diseases

Cultivated plants may have their corms consumed by mice and other rodents,141 including voles, squirrels,142 and chipmunks. They are also attacked by mildew, gray mold, botrytis, and fusarium rot. Root rot may also occur, caused by Stromatinia gladioli and Pythium species. The nematode Pratylenchus penetrans may also cause root rot.143 Viruses that are known to infect Crocus spp include: Potyviruses, especially bean yellow mosaic virus and also tobacco rattle virus, tobaccos necrosis virus, and cucumber mosaic virus.144 The foliage may experience rot, rust, and scab diseases and be fed upon by aphids, mites, snails, and slugs.145 The foliage is eaten by hares, rabbits, and deer; the flowers are sometimes removed by birds, including crows, jackdaws, and magpies.146

Cultivation

Saffron

Main article: Saffron

The economic importance of the genus is largely dependent on the single species, Crocus sativus, now known only in cultivation.147 C. sativus is grown for the production of saffron, an orange-red derivative of its dried stigma, and among the most expensive spices in the world.148 The estimated worldwide production of C. sativus plants is 205 tons.149 About 180,000 stigmas from 60,000 flowers are required to produce 1 kilogram (2.2 lb) saffron, which sells for about US$10,000 (2018). Modern saffron production is widely cultivated in Kashmir, Iran, Turkey, Afghanistan and the Mediterranean from Spain to Asia Minor.150 An important center is the eponymous town of Krokos, in the Kozani region of Greece. The saffron product, Krokos Kozanis is a PDO (Protected Designation of Origin).151152 Production is largely indigenous and Iran accounts for 65% of global production, covering 72,162 ha.153

Saffron is thought to have been used in embalming in Ancient Egypt. It is mentioned in the Old Testament, in the Song of Songs as a precious spice and has featured as a dye and fragrance throughout written history, with mention in the Iliad.154

Cultivation and harvesting of C. sativus for saffron was first documented in the Mediterranean, notably on the island of Crete. Frescos showing them are found there at the Bronze Age Minoan site of Knossos, as well as from the comparably aged Akrotiri site on the Aegean island of Santorini,155156 and formed an important part of the Minoan economy and culture and had both a sacred role and use as a psychoactive drug and food additive.157158159 Women still gather crocuses in the Akrotiri region.160

Horticulture and floriculture

Crocuses were described in Turkish gardens in the early sixteenth century,161 gathered from the far reaches of the Ottoman Empire,162 where they were seen by visiting European botanists and explorers, among the first of whom was Pierre Belon who arrived in Constantinople in 1547. The first crocus seen in the Netherlands, where crocus species were not native, were from corms brought to Vienna in 1562 from Constantinople by the Holy Roman Emperor's ambassador to the Sublime Porte, Ogier Ghiselin de Busbecq. A few corms were forwarded to Carolus Clusius at the botanical garden in Leiden.163 These were almost certainly cultivated varieties rather than wild species.164 European visitors to Turkey continued to bring back specimens for gardens in their own country. Prominent among the latter were the gardens at Middelburg in the Netherlands. Jehan Somer, a Middelburg merchant, brought back crocuses among his other specimens in 1592, where they attracted the attention not only of Clusius but of the early Dutch flower painters, notably Ambrosius Bosschaert.165166 By 1620, new garden varieties had been developed, and featured in contemporary illustrations, such as that of Crispijn van de Passe in his Hortus floridus of 1614.167 There are accounts of crocus gardens in the seventeenth century, such as the Saffron Garth of Walter Stonehouse at Darfield, Yorkshire.168

Crocuses are among the most important ornamental geophytes in the global flower industry,169 ranking sixth in terms of Dutch bulb production (2003–2008) with 463–668 ha under cultivation.170 The crocus is one of the most popular flowers found in the garden in the late winter and early spring.171 About 30 of the species are cultivated, among the most popular being C. chrysanthus, C. flavus, C. sieberi, C. tommasinianus and C. vernus, together with hundreds of cultivars derived from them.172173 Both fall and spring blooming crocuses are cultivated for their flowers.174 Among the first flowers to bloom in spring, their flowering time can vary from fall to the late winter blooming C. tommasinianus; the earliest fall blooming species, C. scharojanii, may flower during the last weeks of July.175

The varieties cultivated for decoration in gardens and pots mainly represent six species: C. vernus, C. chrysanthus, C. flavus, C. sieberi, C. speciosus and C. tommasinianus. During the horticulture production year 2009/2010, more than 70 cultivars were grown in Holland, covering an area of 366 hectares; the most common ones were 'Flower Record' and 'King of the Stripes' which accounted for 42 hectares, other species grown included C. chrysanthus, C. tommasinianus, and C. flavus - all are spring blooming plants.176 But the most commonly grown plants are the Dutch hybrids with large flowers in a rich palette of colors.177

Both sexual and asexual means are used to increase the number of plants; seeds and multiplication of corms are the most common means of production, but tissue culture can be used,178 most commonly for saffron crocus. New corms are formed on top of the older corm which withers away, and cormels are produced from axillary buds.179 The production of new plants begins with harvested corms in late June to early July, after being graded by corm size the corms are stored around 22 Celsius until early October when they are moved to 17 Celsius until planted later in October and November; flowering occurs in March and the flowers are not removed. Crocuses are also forced to produce flowering plants out of season and the most common species used are C. vernus and C. flavus, and most of the corms used for forcing come from the Netherlands.180

Spring flowering types are planted in fall, while fall-blooming types in late summer; typically, the corms are placed 3 to 4 inches deep in well-draining soil in areas with full sun exposure. They do not thrive in heavy clay soils or those that are damp, especially during their summer dormancy period.181 Commercial crops are produced on raised beds and slopes, to ensure adequate drainage, while horticulturalists often plant on sand beds for the same purpose.182 Spring flowering types also do well in areas with deciduous trees, where they flower and produce leaves before the trees completely leaf-out. Crocuses are grown in USDA winter zones 3–8.183 Not all species are hardy in the upper zones; C. sativus is winter hardy in USDA zones 6 through 8, and C. pulchellus is hardy in zones 5 through 8.184

Some are suitable for naturalizing in grass, but mowing off the foliage before it turns yellow produces short lived plants. Some crocuses, especially C. tommasinianus and its selected forms and hybrids (such as 'Whitewell Purple' and 'Ruby Giant'), seed prolifically and are ideal for naturalizing. They can, however, become weeds in rock gardens, where they will often appear in the middle of choice, mat-forming alpine plants, and can be difficult to remove. Crocus flowers and leaves are protected from frost by a waxy cuticle; in areas where snow and frost occasionally occur in the early spring, it is not uncommon to see early flowering crocuses blooming through a light late snowfall.185

Autumn crocus

Autumn-flowering species of crocus that are cultivated include:186

C. laevigatus has a long flowering period which starts in late autumn or early winter and may continue into February.

Colchicum autumnale is commonly known as "autumn crocus", but is a member of the plant family Colchicaceae, and not a true crocus (of the family Iridaceae).

Uses

The corms of crocuses have been used as foodstuffs in Syria.187 The carotenoids found in the styles of Crocus species, particularly C. sativus have been shown to inhibit cancer cell proliferation, and have led to interest in potential pharmaceutical applications.188

Culture

The crocus or krokos has been known since ancient times, and used in decorative arts, such as the Minoan wall paintings in Santorini from ca. 1,600 BC.189 Representations of the saffron crocus appear frequently in Minoan art190 and pervade Aegean art from the Early Bronze Age to the Mycenaean period.191 Theophrastos (4th century BC) described the saffron crocus as being valued as a spice and dye, while Homer compares a sunrise to the flower colour.192 Saffron coloured robes were much admired by women in antiquity193 and gave the garment Crocota its name.194 The oil was also valued as a cosmetic.195 According to Greek legend Crocus or Krokus (Greek: Κρόκος), was a mortal youth the gods turned into a plant bearing his name, the crocus, after his death caused by his great desire and unfulfilled love for the shepherdess Smilax.196 Other versions state that as he died three tears fell into the flower becoming its three stigmata.197198

Crocuses occur in many flower paintings, one of the earliest being that of Ambrosius Bosschaert's Composed Bouquet of Spring Flowers (1620). In this painting the cream-colored crocus feathered with bronze at the base of the bouquet reflected varieties on the market at that time. Bosschaert, working from a preparatory drawing to paint his composed piece spanning the whole of spring, exaggerated the crocus so that it passes for a tulip, but its narrow, grass-like leaves give it away.

The crocus is used in many contexts to symbolically denote spring and new beginnings. For instance, it was used as the emblem of the 2019 FIFA U-20 World Cup in Poland to symbolise the emergence of new talent.199

Crocus in artWoman picking saffron crocusc.1400(Tacuinum Sanitatis)Composed Bouquet of Spring FlowersAmbrosius Bosschaert c.1620Saffron crocusCrispijn van de Passe, 1614Decorative Landscape with CrocusesGrant Wood, 1912

Notes

Bibliography

Books

Gardening, horticulture and floriculture

Dictionaries and encyclopedias

Historical sources (chronological)

Antiquity 14th century 16th century 17th century 18th century 19th century

Chapters

Articles

Phylogeny and taxonomy

Novel taxa

Historical accounts

Websites

Organisations and collections

Databases and flora

References

  1. Goldblatt et al 1998, pp. 295–296. - Goldblatt, P; Manning, J C; Rudall, P (1998). "Iridaceae: 61 Crocus L.". In Kubitzki, Klaus; Huber, Herbert (eds.). Flowering plants. Monocotyledons: Lilianae (except Orchidaceae). The families and genera of vascular plants. Vol. 3. Berlin: Springer-Verlag. pp. 330–331. ISBN 3-540-64060-6. https://books.google.com/books?id=FyPVYzL76sMC ↩

  2. Meerow 2012, p. 23. - Meerow, Alan W (2012). Taxonomy and phylogeny. CRC Press. pp. 17–56. ISBN 9781439849248. https://books.google.com/books?id=5B-ucdbgA3wC&pg=PA17 ↩

  3. Goldblatt et al 1998. - Goldblatt, P; Manning, J C; Rudall, P (1998). "Iridaceae: 61 Crocus L.". In Kubitzki, Klaus; Huber, Herbert (eds.). Flowering plants. Monocotyledons: Lilianae (except Orchidaceae). The families and genera of vascular plants. Vol. 3. Berlin: Springer-Verlag. pp. 330–331. ISBN 3-540-64060-6. https://books.google.com/books?id=FyPVYzL76sMC ↩

  4. Zhao et al 2004. - Zhao, Yu-tang; Noltie, Henry J.; Mathew, Brian F. (2004). "Crocus Linnaeus, Sp. Pl. 1: 36. 1753". p. 313. Retrieved 6 January 2022. http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=108403 ↩

  5. Goldblatt et al 1998, p. 297. - Goldblatt, P; Manning, J C; Rudall, P (1998). "Iridaceae: 61 Crocus L.". In Kubitzki, Klaus; Huber, Herbert (eds.). Flowering plants. Monocotyledons: Lilianae (except Orchidaceae). The families and genera of vascular plants. Vol. 3. Berlin: Springer-Verlag. pp. 330–331. ISBN 3-540-64060-6. https://books.google.com/books?id=FyPVYzL76sMC ↩

  6. Rudall & Mathew 1990. - Rudall, Paula; Mathew, Brian (1990). "Leaf Anatomy in Crocus (Iridaceae)". Kew Bulletin. 45 (3): 535–544. Bibcode:1990KewBu..45..535R. doi:10.2307/4110516. JSTOR 4110516. https://ui.adsabs.harvard.edu/abs/1990KewBu..45..535R ↩

  7. Goldblatt et al 1998. - Goldblatt, P; Manning, J C; Rudall, P (1998). "Iridaceae: 61 Crocus L.". In Kubitzki, Klaus; Huber, Herbert (eds.). Flowering plants. Monocotyledons: Lilianae (except Orchidaceae). The families and genera of vascular plants. Vol. 3. Berlin: Springer-Verlag. pp. 330–331. ISBN 3-540-64060-6. https://books.google.com/books?id=FyPVYzL76sMC ↩

  8. Zhao et al 2004. - Zhao, Yu-tang; Noltie, Henry J.; Mathew, Brian F. (2004). "Crocus Linnaeus, Sp. Pl. 1: 36. 1753". p. 313. Retrieved 6 January 2022. http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=108403 ↩

  9. Kafi et al 2018. - Kafi, Muhammad; Kamili, Azra N; Husaini, Amjad N; et al. (2018). "An expensive spice saffron (Crocus sativus L.): A Case Study from Kashmir, Iran and Turkey". In Ozturk, Munir; Hakeem, Khalid Rehman; Ashraf, Muhammad; Ahmad, Muhammad Sajid Aqeel (eds.). Global Perspectives on Underutilized Crops. Springer Nature. pp. 109–150. ISBN 978-3-319-77776-4. https://books.google.com/books?id=eC1bDwAAQBAJ ↩

  10. Kerndorff et al 2015. - Kerndorff, Helmut; Pasche, Erich; Harpke, Dörte (2015). "The Genus Crocus (Liliiflorae, Iridaceae): Lifecycle, Morphology, Phenotypic Characteristics, and Taxonomical Relevant Parameters" (PDF). Stapfia. 103: 27–65. https://www.zobodat.at/pdf/STAPFIA_0103_0027-0065.pdf ↩

  11. Goldblatt et al 1998. - Goldblatt, P; Manning, J C; Rudall, P (1998). "Iridaceae: 61 Crocus L.". In Kubitzki, Klaus; Huber, Herbert (eds.). Flowering plants. Monocotyledons: Lilianae (except Orchidaceae). The families and genera of vascular plants. Vol. 3. Berlin: Springer-Verlag. pp. 330–331. ISBN 3-540-64060-6. https://books.google.com/books?id=FyPVYzL76sMC ↩

  12. Zhao et al 2004. - Zhao, Yu-tang; Noltie, Henry J.; Mathew, Brian F. (2004). "Crocus Linnaeus, Sp. Pl. 1: 36. 1753". p. 313. Retrieved 6 January 2022. http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=108403 ↩

  13. Goldblatt et al 1998. - Goldblatt, P; Manning, J C; Rudall, P (1998). "Iridaceae: 61 Crocus L.". In Kubitzki, Klaus; Huber, Herbert (eds.). Flowering plants. Monocotyledons: Lilianae (except Orchidaceae). The families and genera of vascular plants. Vol. 3. Berlin: Springer-Verlag. pp. 330–331. ISBN 3-540-64060-6. https://books.google.com/books?id=FyPVYzL76sMC ↩

  14. Zhao et al 2004. - Zhao, Yu-tang; Noltie, Henry J.; Mathew, Brian F. (2004). "Crocus Linnaeus, Sp. Pl. 1: 36. 1753". p. 313. Retrieved 6 January 2022. http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=108403 ↩

  15. Mabberley 1997. - Mabberley, D. J. (1997) [1987]. "Crocus". The Plant-Book: A Portable Dictionary of the Vascular Plants (2nd ed.). Cambridge University Press. p. 194. ISBN 978-0-521-41421-0. https://books.google.com/books?id=ZVdoUPtqKCIC ↩

  16. Goldblatt et al 1998, p. 307. - Goldblatt, P; Manning, J C; Rudall, P (1998). "Iridaceae: 61 Crocus L.". In Kubitzki, Klaus; Huber, Herbert (eds.). Flowering plants. Monocotyledons: Lilianae (except Orchidaceae). The families and genera of vascular plants. Vol. 3. Berlin: Springer-Verlag. pp. 330–331. ISBN 3-540-64060-6. https://books.google.com/books?id=FyPVYzL76sMC ↩

  17. Goldblatt et al 1998. - Goldblatt, P; Manning, J C; Rudall, P (1998). "Iridaceae: 61 Crocus L.". In Kubitzki, Klaus; Huber, Herbert (eds.). Flowering plants. Monocotyledons: Lilianae (except Orchidaceae). The families and genera of vascular plants. Vol. 3. Berlin: Springer-Verlag. pp. 330–331. ISBN 3-540-64060-6. https://books.google.com/books?id=FyPVYzL76sMC ↩

  18. Zhao et al 2004. - Zhao, Yu-tang; Noltie, Henry J.; Mathew, Brian F. (2004). "Crocus Linnaeus, Sp. Pl. 1: 36. 1753". p. 313. Retrieved 6 January 2022. http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=108403 ↩

  19. Ali & Mathew 2011. - Ali, S. I.; Mathew, Brian (2011). "Crocus L." Flora of Pakistan. Missouri Botanical Garden. Retrieved 7 January 2022. http://legacy.tropicos.org/Name/40016737?projectid=32 ↩

  20. Goldblatt et al 1998, pp. 306, 309–310. - Goldblatt, P; Manning, J C; Rudall, P (1998). "Iridaceae: 61 Crocus L.". In Kubitzki, Klaus; Huber, Herbert (eds.). Flowering plants. Monocotyledons: Lilianae (except Orchidaceae). The families and genera of vascular plants. Vol. 3. Berlin: Springer-Verlag. pp. 330–331. ISBN 3-540-64060-6. https://books.google.com/books?id=FyPVYzL76sMC ↩

  21. Mabberley 1997. - Mabberley, D. J. (1997) [1987]. "Crocus". The Plant-Book: A Portable Dictionary of the Vascular Plants (2nd ed.). Cambridge University Press. p. 194. ISBN 978-0-521-41421-0. https://books.google.com/books?id=ZVdoUPtqKCIC ↩

  22. Koocheki & Khajeh-Hosseini 2020. - Koocheki, Alireza; Khajeh-Hosseini, Mohammad, eds. (2020). Saffron: Science, Technology and Health. Food Science, Technology and Nutrition. Woodhead Publishing. ISBN 978-0-12-818740-1. https://books.google.com/books?id=q8i2DwAAQBAJ ↩

  23. Harpke et al 2013. - Harpke, Dörte; Meng, Shuchun; Rutten, Twan; Kerndorff, Helmut; Blattner, Frank R. (March 2013). "Phylogeny of Crocus (Iridaceae) based on one chloroplast and two nuclear loci: Ancient hybridization and chromosome number evolution". Molecular Phylogenetics and Evolution. 66 (3): 617–627. Bibcode:2013MolPE..66..617H. doi:10.1016/j.ympev.2012.10.007. PMID 23123733. https://ui.adsabs.harvard.edu/abs/2013MolPE..66..617H ↩

  24. Goldblatt et al 1998, p. 307. - Goldblatt, P; Manning, J C; Rudall, P (1998). "Iridaceae: 61 Crocus L.". In Kubitzki, Klaus; Huber, Herbert (eds.). Flowering plants. Monocotyledons: Lilianae (except Orchidaceae). The families and genera of vascular plants. Vol. 3. Berlin: Springer-Verlag. pp. 330–331. ISBN 3-540-64060-6. https://books.google.com/books?id=FyPVYzL76sMC ↩

  25. NCBI 2022a. - NCBI (2022a). "CID 5281233, Crocin". PubChem. Bethesda MD: National Library of Medicine. Retrieved 24 January 2022. https://pubchem.ncbi.nlm.nih.gov/compound/Crocin ↩

  26. NCBI 2022b. - NCBI (2022b). "CID 5281232, Crocetin". PubChem. Bethesda MD: National Library of Medicine. Retrieved 24 January 2022. https://pubchem.ncbi.nlm.nih.gov/compound/Crocetin ↩

  27. Goldblatt et al 1998, p. 311. - Goldblatt, P; Manning, J C; Rudall, P (1998). "Iridaceae: 61 Crocus L.". In Kubitzki, Klaus; Huber, Herbert (eds.). Flowering plants. Monocotyledons: Lilianae (except Orchidaceae). The families and genera of vascular plants. Vol. 3. Berlin: Springer-Verlag. pp. 330–331. ISBN 3-540-64060-6. https://books.google.com/books?id=FyPVYzL76sMC ↩

  28. Mohtashami et al 2021. - Mohtashami, Leila; Amiri, Mohammad Sadegh; Ramezani, Mahin; Emami, Seyed Ahmad; Simal-Gandara, Jesus (November 2021). "The genus Crocus L.: A review of ethnobotanical uses, phytochemistry and pharmacology". Industrial Crops and Products. 171: 113923. doi:10.1016/j.indcrop.2021.113923. https://doi.org/10.1016%2Fj.indcrop.2021.113923 ↩

  29. Harris 2022. - Harris, Stephen (2022). "Crocus species (Iridaceae)". Oxford University Plants 400. Department of Plant Sciences, Oxford University. Retrieved 8 January 2022. https://herbaria.plants.ox.ac.uk/bol/plants400/Profiles/cd/crocus ↩

  30. Serviss et al 2016. - Serviss, Brett E.; Peck, James H.; Benjamin, Kristen R. (2016). "Crocus flavus: a new genus and species of non-native Iridaceae for the Arkansas (U.S.A.) flora". Journal of the Botanical Research Institute of Texas. 10 (2): 513–516. JSTOR 44858594. https://www.jstor.org/stable/44858594 ↩

  31. Caiola & Canini 2010. - Caiola, Maria Grilli; Canini, Antonella (2010). "Looking for Saffron's (Crocus sativus L.) Parents" (PDF). Functional Plant Science and Biotechnology. 4 (2): 1–14. http://www.globalsciencebooks.info/Online/GSBOnline/images/2010/FPSB_4(SI2)/FPSB_4(SI2)1-14o.pdf ↩

  32. As a perfume (ἀρωμάτων) "καὶ πρὸς τούτοις τὸ κρόκινον· βέλτιστος δ’ ἐν Αἰγίνῃ καὶ Κιλικίᾳ (the saffron-perfume; the crocus which produces this is best in Aegina and Cilicia)". He also refers to the crocus as a spice (at 34), the word being interchangeable for either use[23] ↩

  33. Negbi 1989. - Negbi, Moshe (May 1989). "Theophrastus on geophytes". Botanical Journal of the Linnean Society. 100 (1): 15–43. doi:10.1111/j.1095-8339.1989.tb01708.x. https://doi.org/10.1111%2Fj.1095-8339.1989.tb01708.x ↩

  34. BL 2022. - BL (2022). "Detailed record for Egerton 747 (ca. 1300–1330)". Catalogue of Illuminated Manuscripts. Retrieved 20 January 2022. https://www.bl.uk/catalogues/illuminatedmanuscripts/record.asp?MSID=8319&CollID=28&NStart=747 ↩

  35. Pavord 2005, p. 111. - Pavord, Anna (2005). The naming of names the search for order in the world of plants. New York: Bloomsbury Publishing USA. ISBN 978-1-59691-965-5. https://books.google.com/books?id=qksX1BeWkqcC ↩

  36. Turner 1548. - Turner, William (1548). "Crocus". The Names of Herbes (1881 ed.). London: English dialect society. p. 31. https://books.google.com/books?id=ZYIrUD8lP90C ↩

  37. Gerard 1597. - Gerard, John (1597). "80. Of Saffron". The Herball or Generall Historie of Plantes (1st ed.). London: John Norton. pp. 123–131. https://archive.org/details/mobot31753000817749/page/122/mode/2up ↩

  38. Kerndorff et al 2016. - Kerndorff, Helmut; Pasche, Erich; Harpke, Dörte (2016). "The Genus Crocus (Liliiflorae, Iridaceae): Taxonomical Problems and How to Determine a Species Nowadays?" (PDF). Stapfia. 105: 42–5o. https://www.zobodat.at/pdf/STAPFIA_105_0042-0050.pdf ↩

  39. Parkinson 1656. - Parkinson, John (1656). "Crocus saffron". Paradisi in Sole Paradisus Terrestris, or, A Choise Garden of All Sorts of Rarest Flowers with their Nature, Place of Birth, Time of Flowering, Names, and Vertues to Each Plant, Useful in Physic or Admired for Beauty: To which is Annext a Kitchin-Garden Furnished with All Manner of Herbs, Roots, and Fruits, for Meat or Sauce Used with Us, with the Art of Planting an Orchard... All Unmentioned in Former Herbals. London: Printed by R.N. and are to be sold by Richard Thrale at his shop at the signe of the Cross-Keys at S. Pauls-gate, going into Cheap-side. pp. 160–170. https://www.biodiversitylibrary.org/bibliography/69836 ↩

  40. l'Obel 1576. - l'Obel, Matthias de (1576). "Crocus". Plantarum, seu, Stirpium historia. Cui annexum est aduersariorum volumen (in Latin). Antwerp: Christophori Plantini. p. 53. https://www.biodiversitylibrary.org/item/37879#page/737/mode/1up ↩

  41. Besler 1640. - Besler, Basilius (1640) [1613]. Hortus Eystettensis, sive, Diligens et accurata omnium plantarum, florum, stirpium: ex variis orbis terrae partibus, singulari studio collectarum, quae in celeberrimis viridariis arcem episcopalem ibidem cingentibus, olim conspiciebantur delineatio et ad vivum repraesentatio et advivum repraesentatio opera (in Latin). Nürnberg. https://www.biodiversitylibrary.org/bibliography/45339#/summary ↩

  42. Maratti 1772. - Maratti, Giovanni Francesco [in Spanish] (1772). Plantarum Romuleae, et Saturniae in agro Romano existentium: specificas notas describit inventor (in Latin). Rome: Typis Archangeli Casaletti. https://books.google.com/books?id=Ik0aAAAAYAAJ ↩

  43. Peruzzi et al 2013. - Peruzzi, Lorenzo; Carta, Angelino; Garbari, Fabio (22 October 2013). "Lectotypification of the name Crocus sativus var. vernus L. (Iridaceae) and its consequences within Crocus ser. Verni". Taxon. 62 (5): 1037–1040. doi:10.12705/625.7. https://doi.org/10.12705%2F625.7 ↩

  44. Linnaeus 1753. - Linnaeus, Carl (1753). "Crocus". Species Plantarum: exhibentes plantas rite cognitas, ad genera relatas, cum differentiis specificis, nominibus trivialibus, synonymis selectis, locis natalibus, secundum systema sexuale digestas. Vol. 1. Stockholm: Impensis Laurentii Salvii. p. 36. https://www.biodiversitylibrary.org/item/13829#page/48/mode/1up ↩

  45. Jussieu 1789. - Jussieu, Antoine Laurent de (1789). "Crocus". Genera plantarum: secundum ordines naturales disposita, juxta methodum in Horto regio parisiensi exaratam, anno M.DCC.LXXIV (in Latin). Paris. p. 59. OCLC 5161409. https://www.biodiversitylibrary.org/item/7125#page/154/mode/1up ↩

  46. Haworth 1820. - Haworth, Adrian (1820). "On the Cultivation of Crocuses, with a short Account of the different Species known at present. February 7, 1809". Transactions of the Horticultural Society of London. 1. M. Bulmer & Co.: 122–139. https://www.biodiversitylibrary.org/item/151339#page/145/mode/1up ↩

  47. Sabine 1830. - Sabine, Joseph (1830). "An Account and Description of the Species and most remarkable Varieties of Spring Crocuses, cultivated in the Garden of the Horticultural Society. January 6, 1829". Transactions of the Horticultural Society of London. 7: III: 419–432, IV: 433–498. https://www.biodiversitylibrary.org/item/155840#page/482/mode/1up ↩

  48. Kerndorff et al 2016. - Kerndorff, Helmut; Pasche, Erich; Harpke, Dörte (2016). "The Genus Crocus (Liliiflorae, Iridaceae): Taxonomical Problems and How to Determine a Species Nowadays?" (PDF). Stapfia. 105: 42–5o. https://www.zobodat.at/pdf/STAPFIA_105_0042-0050.pdf ↩

  49. Herbert 1847. - Herbert, William (1847). "A History of the Species of Crocus". The Journal of the Horticultural Society of London. 2: 249–293. https://www.biodiversitylibrary.org/page/43585461#page/267/mode/1up ↩

  50. Lindley 1853, p. 161. - Lindley, John (1853) [1846]. The Vegetable Kingdom: or, The structure, classification, and uses of plants, illustrated upon the natural system (3rd. ed.). London: Bradbury & Evans. https://www.biodiversitylibrary.org/bibliography/95459#/summary ↩

  51. Baker 1874. - Baker, John Gilbert (1874). "A Classified Synonymic List of all the Known Crocuses, with their Native Countries, and References to the Works where they are Figured". Journal of the Royal Horticultural Society of London. 4 (14): 111–119. https://www.biodiversitylibrary.org/item/152500#page/129/mode/1up ↩

  52. Bentham & Hooker 1883, p. 693. - Bentham, G.; Hooker, J.D. (1883). "Crocus". Genera plantarum ad exemplaria imprimis in herbariis kewensibus servata definita. Vol. III Part II. London: L Reeve & Co. p. 693. https://www.biodiversitylibrary.org/item/14690#page/254/mode/1up ↩

  53. Maw 1886, p. 22. - Maw, George (1886). A monograph of the genus Crocus. With an appendix on the etymology of the words crocus and saffron by C.C. Lacaita. London: Dulau and Co. https://www.biodiversitylibrary.org/bibliography/15481 ↩

  54. APG I 1998. - Angiosperm Phylogeny Group (1998). "An ordinal classification for the families of flowering plants". Annals of the Missouri Botanical Garden. 85 (4): 531–553. doi:10.2307/2992015. JSTOR 2992015. https://www.researchgate.net/publication/279592674 ↩

  55. Sims 1803. - Sims, John (1803). "Crocus susianus. Cloth of Gold Crocus". Curtis's Botanical Magazine. 18: T652. https://www.biodiversitylibrary.org/item/14296#page/139/mode/1up ↩

  56. Davies 2001. - Davies, Kevin L. (2001). "The life and work of Sydenham Edwards FLS, Welshman, Botanical and Animal Draughtsman 1768-1819". Minerva - The Journal of Swansea History. 9: 30–58. https://journals.library.wales/view/1225327/1225824/35#?xywh=-1752%2C-197%2C5933%2C3913 ↩

  57. Haworth 1820. - Haworth, Adrian (1820). "On the Cultivation of Crocuses, with a short Account of the different Species known at present. February 7, 1809". Transactions of the Horticultural Society of London. 1. M. Bulmer & Co.: 122–139. https://www.biodiversitylibrary.org/item/151339#page/145/mode/1up ↩

  58. Sabine 1830. - Sabine, Joseph (1830). "An Account and Description of the Species and most remarkable Varieties of Spring Crocuses, cultivated in the Garden of the Horticultural Society. January 6, 1829". Transactions of the Horticultural Society of London. 7: III: 419–432, IV: 433–498. https://www.biodiversitylibrary.org/item/155840#page/482/mode/1up ↩

  59. Maw 1886. - Maw, George (1886). A monograph of the genus Crocus. With an appendix on the etymology of the words crocus and saffron by C.C. Lacaita. London: Dulau and Co. https://www.biodiversitylibrary.org/bibliography/15481 ↩

  60. Masclef 1890–1893. - Masclef, Amédée (1890–1893). Atlas des plantes de France 3 vols. Vol. 3. p. 328. https://www.biodiversitylibrary.org/bibliography/146304 ↩

  61. Goldblatt originally described this tribe in 2006,[49] but in 2011 renamed it Ixieae, having discovered that this name had precedence[50] /wiki/Peter_Goldblatt ↩

  62. Goldblatt et al 1998, p. 312. - Goldblatt, P; Manning, J C; Rudall, P (1998). "Iridaceae: 61 Crocus L.". In Kubitzki, Klaus; Huber, Herbert (eds.). Flowering plants. Monocotyledons: Lilianae (except Orchidaceae). The families and genera of vascular plants. Vol. 3. Berlin: Springer-Verlag. pp. 330–331. ISBN 3-540-64060-6. https://books.google.com/books?id=FyPVYzL76sMC ↩

  63. Phillips & Rix 1989, p. 31. - Phillips, Roger; Rix, Martyn (1989). The Random House Book of Bulbs. Random House. ISBN 978-0-679-72756-9. https://books.google.com/books?id=o_7wAAAAMAAJ ↩

  64. Goldblatt et al 1998, p. 312. - Goldblatt, P; Manning, J C; Rudall, P (1998). "Iridaceae: 61 Crocus L.". In Kubitzki, Klaus; Huber, Herbert (eds.). Flowering plants. Monocotyledons: Lilianae (except Orchidaceae). The families and genera of vascular plants. Vol. 3. Berlin: Springer-Verlag. pp. 330–331. ISBN 3-540-64060-6. https://books.google.com/books?id=FyPVYzL76sMC ↩

  65. Goldblatt et al 2006. - Goldblatt, Peter; Davies, Jonathan; Manning, John; van der Bank, Michelle; Savolainen, Vincent (2006). "Phylogeny of Iridaceae Subfamily Crocoideae Based on a Combined Multigene Plastid DNA Analysis". Aliso. 22 (1): 399–411. doi:10.5642/aliso.20062201.32. https://doi.org/10.5642%2Faliso.20062201.32 ↩

  66. Petersen et al 2008. - Petersen, Gitte; Seberg, Ole; Thorsøe, Sarah; Jørgensen, Tina; Mathew, Brian (2008). "A Phylogeny of the Genus Crocus (Iridaceae) Based on Sequence Data from Five Plastid Regions". Taxon. 57 (2): 487–499. doi:10.2307/25066017. JSTOR 25066017. https://doi.org/10.2307%2F25066017 ↩

  67. Harpke et al 2013. - Harpke, Dörte; Meng, Shuchun; Rutten, Twan; Kerndorff, Helmut; Blattner, Frank R. (March 2013). "Phylogeny of Crocus (Iridaceae) based on one chloroplast and two nuclear loci: Ancient hybridization and chromosome number evolution". Molecular Phylogenetics and Evolution. 66 (3): 617–627. Bibcode:2013MolPE..66..617H. doi:10.1016/j.ympev.2012.10.007. PMID 23123733. https://ui.adsabs.harvard.edu/abs/2013MolPE..66..617H ↩

  68. Kerndorff et al 2016. - Kerndorff, Helmut; Pasche, Erich; Harpke, Dörte (2016). "The Genus Crocus (Liliiflorae, Iridaceae): Taxonomical Problems and How to Determine a Species Nowadays?" (PDF). Stapfia. 105: 42–5o. https://www.zobodat.at/pdf/STAPFIA_105_0042-0050.pdf ↩

  69. Haworth 1820. - Haworth, Adrian (1820). "On the Cultivation of Crocuses, with a short Account of the different Species known at present. February 7, 1809". Transactions of the Horticultural Society of London. 1. M. Bulmer & Co.: 122–139. https://www.biodiversitylibrary.org/item/151339#page/145/mode/1up ↩

  70. Sabine 1830. - Sabine, Joseph (1830). "An Account and Description of the Species and most remarkable Varieties of Spring Crocuses, cultivated in the Garden of the Horticultural Society. January 6, 1829". Transactions of the Horticultural Society of London. 7: III: 419–432, IV: 433–498. https://www.biodiversitylibrary.org/item/155840#page/482/mode/1up ↩

  71. Herbert 1847. - Herbert, William (1847). "A History of the Species of Crocus". The Journal of the Horticultural Society of London. 2: 249–293. https://www.biodiversitylibrary.org/page/43585461#page/267/mode/1up ↩

  72. Kerndorff et al 2016. - Kerndorff, Helmut; Pasche, Erich; Harpke, Dörte (2016). "The Genus Crocus (Liliiflorae, Iridaceae): Taxonomical Problems and How to Determine a Species Nowadays?" (PDF). Stapfia. 105: 42–5o. https://www.zobodat.at/pdf/STAPFIA_105_0042-0050.pdf ↩

  73. Maw 1886. - Maw, George (1886). A monograph of the genus Crocus. With an appendix on the etymology of the words crocus and saffron by C.C. Lacaita. London: Dulau and Co. https://www.biodiversitylibrary.org/bibliography/15481 ↩

  74. Mathew 1986. - Mathew, Brian (1986). "George Maw and his monograph". The Kew Magazine. 3 (4): 186–189. JSTOR 45066517. https://www.jstor.org/stable/45066517 ↩

  75. Harpke et al 2013. - Harpke, Dörte; Meng, Shuchun; Rutten, Twan; Kerndorff, Helmut; Blattner, Frank R. (March 2013). "Phylogeny of Crocus (Iridaceae) based on one chloroplast and two nuclear loci: Ancient hybridization and chromosome number evolution". Molecular Phylogenetics and Evolution. 66 (3): 617–627. Bibcode:2013MolPE..66..617H. doi:10.1016/j.ympev.2012.10.007. PMID 23123733. https://ui.adsabs.harvard.edu/abs/2013MolPE..66..617H ↩

  76. Rix 2008. - Rix, Alison (May 2008). "George Maw, Joseph Hooker and the genus Crocus". Curtis's Botanical Magazine. 25 (2): 176–187. doi:10.1111/j.1467-8748.2008.00616.x. https://doi.org/10.1111%2Fj.1467-8748.2008.00616.x ↩

  77. Kerndorff et al 2016. - Kerndorff, Helmut; Pasche, Erich; Harpke, Dörte (2016). "The Genus Crocus (Liliiflorae, Iridaceae): Taxonomical Problems and How to Determine a Species Nowadays?" (PDF). Stapfia. 105: 42–5o. https://www.zobodat.at/pdf/STAPFIA_105_0042-0050.pdf ↩

  78. Mathew 1983. - Mathew, Brian (1983) [1982]. The Crocus: A Revision of the Genus Crocus (Iridaceae). Portland, Oregon: Timber Press. ISBN 978-0-917304-23-1. https://books.google.com/books?id=gQwmAQAAMAAJ ↩

  79. Harpke et al 2013. - Harpke, Dörte; Meng, Shuchun; Rutten, Twan; Kerndorff, Helmut; Blattner, Frank R. (March 2013). "Phylogeny of Crocus (Iridaceae) based on one chloroplast and two nuclear loci: Ancient hybridization and chromosome number evolution". Molecular Phylogenetics and Evolution. 66 (3): 617–627. Bibcode:2013MolPE..66..617H. doi:10.1016/j.ympev.2012.10.007. PMID 23123733. https://ui.adsabs.harvard.edu/abs/2013MolPE..66..617H ↩

  80. Petersen et al 2008. - Petersen, Gitte; Seberg, Ole; Thorsøe, Sarah; Jørgensen, Tina; Mathew, Brian (2008). "A Phylogeny of the Genus Crocus (Iridaceae) Based on Sequence Data from Five Plastid Regions". Taxon. 57 (2): 487–499. doi:10.2307/25066017. JSTOR 25066017. https://doi.org/10.2307%2F25066017 ↩

  81. Harpke et al 2013. - Harpke, Dörte; Meng, Shuchun; Rutten, Twan; Kerndorff, Helmut; Blattner, Frank R. (March 2013). "Phylogeny of Crocus (Iridaceae) based on one chloroplast and two nuclear loci: Ancient hybridization and chromosome number evolution". Molecular Phylogenetics and Evolution. 66 (3): 617–627. Bibcode:2013MolPE..66..617H. doi:10.1016/j.ympev.2012.10.007. PMID 23123733. https://ui.adsabs.harvard.edu/abs/2013MolPE..66..617H ↩

  82. Raca et al 2020. - Raca, Irena; Harpke, Dörte; Shuka, Lulëzim; Ranđelović, Vladimir (19 October 2020). "A new species of Crocus ser. Verni (Iridaceae) with 2 n = 12 chromosomes from the Balkans". Plant Biosystems. 156: 36–42. doi:10.1080/11263504.2020.1829735. S2CID 225006706. https://doi.org/10.1080%2F11263504.2020.1829735 ↩

  83. Ciftci et al 2020. - Çiftçi, Almila; Harpke, Doerte; Mollman, Rachel; Yildirim, Hasan; Erol, Osman (6 April 2020). "Notes on Crocus L. Series Flavi Mathew (Iridaceae) and a new species with unique corm structure". Phytotaxa. 438 (2): 65–79. doi:10.11646/phytotaxa.438.2.1. S2CID 216439891. https://www.researchgate.net/publication/340455322 ↩

  84. Randelovic et al 2012. - Ranđelović, Novica; Ranđelović, Vladimir; Hristovski, Nikola (April 2012). "Crocus jablanicensis (Iridaceae), a new species from the Republic of Macedonia, Balkan Peninsula". Annales Botanici Fennici. 49 (1–2): 99–102. doi:10.5735/085.049.0116. ISSN 0003-3847. JSTOR 23728141. S2CID 84237883. https://www.researchgate.net/publication/235660562 ↩

  85. Petersen et al 2008. - Petersen, Gitte; Seberg, Ole; Thorsøe, Sarah; Jørgensen, Tina; Mathew, Brian (2008). "A Phylogeny of the Genus Crocus (Iridaceae) Based on Sequence Data from Five Plastid Regions". Taxon. 57 (2): 487–499. doi:10.2307/25066017. JSTOR 25066017. https://doi.org/10.2307%2F25066017 ↩

  86. Harpke et al 2015. - Harpke, Dörte; Carta, Angelino; Tomović, Gordana; Ranđelović, Vladimir; Ranđelović, Novica; Blattner, Frank R.; Peruzzi, Lorenzo (January 2015). "Phylogeny, karyotype evolution and taxonomy of Crocus series Verni (Iridaceae)". Plant Systematics and Evolution. 301 (1): 309–325. Bibcode:2015PSyEv.301..309H. doi:10.1007/s00606-014-1074-0. S2CID 18507508. https://ui.adsabs.harvard.edu/abs/2015PSyEv.301..309H ↩

  87. Kerndorff et al 2016. - Kerndorff, Helmut; Pasche, Erich; Harpke, Dörte (2016). "The Genus Crocus (Liliiflorae, Iridaceae): Taxonomical Problems and How to Determine a Species Nowadays?" (PDF). Stapfia. 105: 42–5o. https://www.zobodat.at/pdf/STAPFIA_105_0042-0050.pdf ↩

  88. Harpke et al 2016. - Harpke, Dörte; Kerndorff, Helmut; Pasche, Erich; Peruzzi, Lorenzi (11 May 2016). "Neotypification of the name Crocus biflorus Mill. (Iridaceae) and its consequences in the taxonomy of the genus". Phytotaxa. 260 (2): 131–143. doi:10.11646/phytotaxa.260.2.3. https://dx.doi.org/10.11646/phytotaxa.260.2.3 ↩

  89. Roma-Marzio et al 2018. - Roma-Marzio, Francesco; Harpke, Doerte; Peruzzi, Lorenzo (9 May 2018). "Rediscovery of Crocus biflorus var. estriatus (Iridaceae) and its taxonomic characterisation". Italian Botanist. 6: 23–30. doi:10.3897/italianbotanist.6.28729. S2CID 91370762. https://doi.org/10.3897%2Fitalianbotanist.6.28729 ↩

  90. Harrison & Larson 2014. - Harrison, Richard G.; Larson, Erica L. (1 December 2014). "Hybridization, Introgression, and the Nature of Species Boundaries". Journal of Heredity. 105 (S1): 795–809. doi:10.1093/jhered/esu033. PMID 25149255. https://doi.org/10.1093%2Fjhered%2Fesu033 ↩

  91. Kerndorff et al 2016. - Kerndorff, Helmut; Pasche, Erich; Harpke, Dörte (2016). "The Genus Crocus (Liliiflorae, Iridaceae): Taxonomical Problems and How to Determine a Species Nowadays?" (PDF). Stapfia. 105: 42–5o. https://www.zobodat.at/pdf/STAPFIA_105_0042-0050.pdf ↩

  92. Petersen et al 2008. - Petersen, Gitte; Seberg, Ole; Thorsøe, Sarah; Jørgensen, Tina; Mathew, Brian (2008). "A Phylogeny of the Genus Crocus (Iridaceae) Based on Sequence Data from Five Plastid Regions". Taxon. 57 (2): 487–499. doi:10.2307/25066017. JSTOR 25066017. https://doi.org/10.2307%2F25066017 ↩

  93. Petersen et al 2008. - Petersen, Gitte; Seberg, Ole; Thorsøe, Sarah; Jørgensen, Tina; Mathew, Brian (2008). "A Phylogeny of the Genus Crocus (Iridaceae) Based on Sequence Data from Five Plastid Regions". Taxon. 57 (2): 487–499. doi:10.2307/25066017. JSTOR 25066017. https://doi.org/10.2307%2F25066017 ↩

  94. Petersen et al 2008. - Petersen, Gitte; Seberg, Ole; Thorsøe, Sarah; Jørgensen, Tina; Mathew, Brian (2008). "A Phylogeny of the Genus Crocus (Iridaceae) Based on Sequence Data from Five Plastid Regions". Taxon. 57 (2): 487–499. doi:10.2307/25066017. JSTOR 25066017. https://doi.org/10.2307%2F25066017 ↩

  95. Harpke et al 2013. - Harpke, Dörte; Meng, Shuchun; Rutten, Twan; Kerndorff, Helmut; Blattner, Frank R. (March 2013). "Phylogeny of Crocus (Iridaceae) based on one chloroplast and two nuclear loci: Ancient hybridization and chromosome number evolution". Molecular Phylogenetics and Evolution. 66 (3): 617–627. Bibcode:2013MolPE..66..617H. doi:10.1016/j.ympev.2012.10.007. PMID 23123733. https://ui.adsabs.harvard.edu/abs/2013MolPE..66..617H ↩

  96. Mathew et al 2009. - Mathew, Brian; Petersen, Gitte; Seberg, Ole (2009). "A reassessment of Crocus based on molecular analysis". The Plantsman. New Series. 8 (1): 50–57. ↩

  97. Harpke et al 2013. - Harpke, Dörte; Meng, Shuchun; Rutten, Twan; Kerndorff, Helmut; Blattner, Frank R. (March 2013). "Phylogeny of Crocus (Iridaceae) based on one chloroplast and two nuclear loci: Ancient hybridization and chromosome number evolution". Molecular Phylogenetics and Evolution. 66 (3): 617–627. Bibcode:2013MolPE..66..617H. doi:10.1016/j.ympev.2012.10.007. PMID 23123733. https://ui.adsabs.harvard.edu/abs/2013MolPE..66..617H ↩

  98. Harpke et al 2013. - Harpke, Dörte; Meng, Shuchun; Rutten, Twan; Kerndorff, Helmut; Blattner, Frank R. (March 2013). "Phylogeny of Crocus (Iridaceae) based on one chloroplast and two nuclear loci: Ancient hybridization and chromosome number evolution". Molecular Phylogenetics and Evolution. 66 (3): 617–627. Bibcode:2013MolPE..66..617H. doi:10.1016/j.ympev.2012.10.007. PMID 23123733. https://ui.adsabs.harvard.edu/abs/2013MolPE..66..617H ↩

  99. Peruzzi et al 2013. - Peruzzi, Lorenzo; Carta, Angelino; Garbari, Fabio (22 October 2013). "Lectotypification of the name Crocus sativus var. vernus L. (Iridaceae) and its consequences within Crocus ser. Verni". Taxon. 62 (5): 1037–1040. doi:10.12705/625.7. https://doi.org/10.12705%2F625.7 ↩

  100. Harpke et al 2015. - Harpke, Dörte; Carta, Angelino; Tomović, Gordana; Ranđelović, Vladimir; Ranđelović, Novica; Blattner, Frank R.; Peruzzi, Lorenzo (January 2015). "Phylogeny, karyotype evolution and taxonomy of Crocus series Verni (Iridaceae)". Plant Systematics and Evolution. 301 (1): 309–325. Bibcode:2015PSyEv.301..309H. doi:10.1007/s00606-014-1074-0. S2CID 18507508. https://ui.adsabs.harvard.edu/abs/2015PSyEv.301..309H ↩

  101. Harpke et al 2014. - Harpke, Dörte; Peruzzi, Lorenzo; Kerndorff, Helmut; Karamplianis, Theophanis; Constantinidis, Theophanis; Ranđelović, Vladimir; Ranđelović, Novica; Jušković, Marina; Pasche, Erich; Blattner, Frank R. (2014). "Phylogeny, geographic distribution, and new taxonomic circumscription of the Crocus reticulatus species group (Iridaceae)". Turkish Journal of Botany. 38: 1182–1198. doi:10.3906/bot-1405-60. https://doi.org/10.3906%2Fbot-1405-60 ↩

  102. Kerndorff et al 2016. - Kerndorff, Helmut; Pasche, Erich; Harpke, Dörte (2016). "The Genus Crocus (Liliiflorae, Iridaceae): Taxonomical Problems and How to Determine a Species Nowadays?" (PDF). Stapfia. 105: 42–5o. https://www.zobodat.at/pdf/STAPFIA_105_0042-0050.pdf ↩

  103. Kerndorff et al 2014. - Kerndorff, Helmut; Pasche, Erich; Harpke, Dörte (2014). "Crocus isauricus Siehe ex BowleS (Liliiflorae, Iridaceae) and its relatives" (PDF). Stapfia. 101: 3–18. https://www.zobodat.at/pdf/STAPFIA_0101_0003-0018.pdf ↩

  104. Kerndorff et al 2013. - Kerndorff, H; Pasche, E; Blattner, FR; Harpke, D (2013). "Fourteen New Species of Crocus (Liliiflorae, Iridaceae) from West, South-West and South-Central Turkey" (PDF). Stapfia. 99: 145–158. https://www.zobodat.at/pdf/STAPFIA_0099_0145-0158.pdf ↩

  105. Harpke et al 2016. - Harpke, Dörte; Kerndorff, Helmut; Pasche, Erich; Peruzzi, Lorenzi (11 May 2016). "Neotypification of the name Crocus biflorus Mill. (Iridaceae) and its consequences in the taxonomy of the genus". Phytotaxa. 260 (2): 131–143. doi:10.11646/phytotaxa.260.2.3. https://dx.doi.org/10.11646/phytotaxa.260.2.3 ↩

  106. Harpke et al 2014. - Harpke, Dörte; Peruzzi, Lorenzo; Kerndorff, Helmut; Karamplianis, Theophanis; Constantinidis, Theophanis; Ranđelović, Vladimir; Ranđelović, Novica; Jušković, Marina; Pasche, Erich; Blattner, Frank R. (2014). "Phylogeny, geographic distribution, and new taxonomic circumscription of the Crocus reticulatus species group (Iridaceae)". Turkish Journal of Botany. 38: 1182–1198. doi:10.3906/bot-1405-60. https://doi.org/10.3906%2Fbot-1405-60 ↩

  107. Mathew et al 2009. - Mathew, Brian; Petersen, Gitte; Seberg, Ole (2009). "A reassessment of Crocus based on molecular analysis". The Plantsman. New Series. 8 (1): 50–57. ↩

  108. Wyman 1986. - Wyman, Donald (1986) [1971]. "Crocus". Wyman's Gardening Encyclopedia (2nd. ed.). Simon & Schuster. pp. 272–274. ISBN 978-0-02-632070-2. https://books.google.com/books?id=XSExQDJtQ7AC ↩

  109. GBIF 2022. - GBIF. "Crocus L." Retrieved 9 January 2022. https://www.gbif.org/species/2747303 ↩

  110. Armitage 2008, p. 278. - Armitage, Allan M. (2008). "Crocus". Herbaceous Perennial Plants: A Treatise on their Identification, Culture, and Garden Attributes (3rd ed.). Cool Springs Press. pp. 301–308. ISBN 978-1-61058-380-0. https://books.google.com/books?id=kA6VgfxsstIC ↩

  111. Bowles 1985, p. 154. - Bowles, E. A. (1985) [1924]. A Handbook of Crocus and Colchicum for Gardeners. Waterstone. ISBN 978-0-947752-26-2. https://books.google.com/books?id=V9tFAAAAYAAJ ↩

  112. Mabberley 1997. - Mabberley, D. J. (1997) [1987]. "Crocus". The Plant-Book: A Portable Dictionary of the Vascular Plants (2nd ed.). Cambridge University Press. p. 194. ISBN 978-0-521-41421-0. https://books.google.com/books?id=ZVdoUPtqKCIC ↩

  113. Runkel & Roosa 2009, p. 7. - Runkel, Sylvan T.; Roosa, Dean M. (2009) [1989]. Wildflowers of the Tallgrass Prairie: The Upper Midwest (2nd. ed.). University of Iowa Press. ISBN 978-1-58729-844-8. https://books.google.com/books?id=EyLjHnUap0UC ↩

  114. Skelly 1994. - Skelly, Carole J. (1994). "Pulsatilla". Dictionary of Herbs, Spices, Seasonings, and Natural Flavorings. Routledge. ISBN 978-1-136-51420-3. https://books.google.com/books?id=oOjGBQAAQBAJ&pg=PT444 ↩

  115. Wencai & Bartholomew 2004. - Wencai, Wang; Bartholomew, Bruce (2004). "Pulsatilla Miller, Gard. Dict. Abr., ed. 4. [1136]. 1754". p. 329. Retrieved 10 January 2022. http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=127637 ↩

  116. Armitage 2008, p. 843. - Armitage, Allan M. (2008). "Crocus". Herbaceous Perennial Plants: A Treatise on their Identification, Culture, and Garden Attributes (3rd ed.). Cool Springs Press. pp. 301–308. ISBN 978-1-61058-380-0. https://books.google.com/books?id=kA6VgfxsstIC ↩

  117. Liddell & Scott 1996a. - Liddell; Scott (1996a). κρόκος , ὁ. Vol. 1. p. 998. https://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.04.0057%3Aentry%3Dkro%2Fkos ↩

  118. Pankhurst & Hyam 1995, p. 134. - Pankhurst, Roger; Hyam, Richard (1995). Plants and their names: a concise dictionary. Oxford: Oxford University Press. ISBN 978-0-19-866189-4. https://books.google.com/books?id=ywIPQgAACAAJ ↩

  119. OED 2022. - Crocus. Oxford University Press. 20 September 2007. ISBN 978-0-19-920687-2. Archived from the original on 10 January 2022. Retrieved 10 January 2022. https://web.archive.org/web/20220110231351/https://www.lexico.com/definition/crocus ↩

  120. Maw 1886. - Maw, George (1886). A monograph of the genus Crocus. With an appendix on the etymology of the words crocus and saffron by C.C. Lacaita. London: Dulau and Co. https://www.biodiversitylibrary.org/bibliography/15481 ↩

  121. Harper 2022. - Harper, Douglas (2022). "Crocus". Online Etymology Dictionary. Retrieved 11 January 2022. https://www.etymonline.com/word/crocus ↩

  122. Sharifi 2010. - Sharifi, G. (January 2010). "Etymology, history and application of saffron (Crocus sativus l.) in ancient Iran". Acta Horticulturae (850): 309–314. doi:10.17660/ActaHortic.2010.850.53. https://doi.org/10.17660%2FActaHortic.2010.850.53 ↩

  123. Randelovic et al 2012. - Ranđelović, Novica; Ranđelović, Vladimir; Hristovski, Nikola (April 2012). "Crocus jablanicensis (Iridaceae), a new species from the Republic of Macedonia, Balkan Peninsula". Annales Botanici Fennici. 49 (1–2): 99–102. doi:10.5735/085.049.0116. ISSN 0003-3847. JSTOR 23728141. S2CID 84237883. https://www.researchgate.net/publication/235660562 ↩

  124. Petersen et al 2008. - Petersen, Gitte; Seberg, Ole; Thorsøe, Sarah; Jørgensen, Tina; Mathew, Brian (2008). "A Phylogeny of the Genus Crocus (Iridaceae) Based on Sequence Data from Five Plastid Regions". Taxon. 57 (2): 487–499. doi:10.2307/25066017. JSTOR 25066017. https://doi.org/10.2307%2F25066017 ↩

  125. WCLSPF 2022. - "Crocus". World Checklist of Selected Plant Families. Royal Botanic Gardens, Kew. Retrieved 4 January 2022. http://apps.kew.org/wcsp/namedetail.do?name_id=327117 ↩

  126. Flora Italiana 2022. - "Elenco delle specie - Genere: Crocus - Famiglia: Iridaceae". Flora Italiana. 2022. Retrieved 5 January 2022. http://luirig.altervista.org/flora/taxa/floraspecie.php?genere=Crocus ↩

  127. Innes 1985. - Innes, Clive (1985). The World of Iridaceae: A Comprehensive Record. Ashington, Sussex: Holly Gate International. ISBN 978-0-948236-01-3. https://books.google.com/books?id=OCAmAQAAMAAJ ↩

  128. Harpke et al 2013. - Harpke, Dörte; Meng, Shuchun; Rutten, Twan; Kerndorff, Helmut; Blattner, Frank R. (March 2013). "Phylogeny of Crocus (Iridaceae) based on one chloroplast and two nuclear loci: Ancient hybridization and chromosome number evolution". Molecular Phylogenetics and Evolution. 66 (3): 617–627. Bibcode:2013MolPE..66..617H. doi:10.1016/j.ympev.2012.10.007. PMID 23123733. https://ui.adsabs.harvard.edu/abs/2013MolPE..66..617H ↩

  129. Ruksans 2011, p. 19. - Ruksans, Janis (2011). Crocuses: A Complete Guide to the Genus. Timber Press. ISBN 978-1-60469-106-1. https://books.google.com/books?id=3pqFWjcZphMC&pg=PA17 ↩

  130. Harris 2022. - Harris, Stephen (2022). "Crocus species (Iridaceae)". Oxford University Plants 400. Department of Plant Sciences, Oxford University. Retrieved 8 January 2022. https://herbaria.plants.ox.ac.uk/bol/plants400/Profiles/cd/crocus ↩

  131. Koocheki & Khajeh-Hosseini 2020. - Koocheki, Alireza; Khajeh-Hosseini, Mohammad, eds. (2020). Saffron: Science, Technology and Health. Food Science, Technology and Nutrition. Woodhead Publishing. ISBN 978-0-12-818740-1. https://books.google.com/books?id=q8i2DwAAQBAJ ↩

  132. Sevinç Kravkaz & Vurdu 2010. - Sevinç Kravkaz, I.; Vurdu, H. (2010). "Botany of Crocus ancyrensis through Domestication". In Tsimidou, Maria Z.; Polissiou, Moschos; Fernández, José Antonio (eds.). Proceedings of the Third International Symposium on Saffron: Forthcoming Challenges in Cultivation, Research and Economics, Krokos, Greece, May 20 2009. ISHS 850. pp. 61–65. ISBN 978-90-6605-732-6. https://www.ishs.org/ishs-book/850 ↩

  133. Maw 1886. - Maw, George (1886). A monograph of the genus Crocus. With an appendix on the etymology of the words crocus and saffron by C.C. Lacaita. London: Dulau and Co. https://www.biodiversitylibrary.org/bibliography/15481 ↩

  134. Jelitto et al 1990. - Jelitto, Leo; Schacht, Wilhelm; Fessler, Alfred (1990) [1950 Eugen Ulmer, Stuttgart]. "Crocus L. Iridaceae". Hardy Herbaceous Perennials [Die Freiland-Schmuckstauden]. Vol. 1 A–K. trans. Michael E Epp (3rd. ed.). Portland, Oregon: Timber Press. pp. 168–174. ISBN 978-0-88192-159-5. https://books.google.com/books?id=utVnAQAACAAJ ↩

  135. Kerndorff et al 2015. - Kerndorff, Helmut; Pasche, Erich; Harpke, Dörte (2015). "The Genus Crocus (Liliiflorae, Iridaceae): Lifecycle, Morphology, Phenotypic Characteristics, and Taxonomical Relevant Parameters" (PDF). Stapfia. 103: 27–65. https://www.zobodat.at/pdf/STAPFIA_0103_0027-0065.pdf ↩

  136. Mabberley 1997. - Mabberley, D. J. (1997) [1987]. "Crocus". The Plant-Book: A Portable Dictionary of the Vascular Plants (2nd ed.). Cambridge University Press. p. 194. ISBN 978-0-521-41421-0. https://books.google.com/books?id=ZVdoUPtqKCIC ↩

  137. Toogood 2019. - Toogood, Alan, ed. (2019) [1999]. "Crocus". Propagating Plants: How to Create New Plants for Free (Revised ed.). Dorling Kindersley (Penguin). p. 265. ISBN 978-1-4654-9898-4. https://books.google.com/books?id=WhfEDwAAQBAJ&pg=PA265 ↩

  138. Goldblatt et al 1998, p. 311. - Goldblatt, P; Manning, J C; Rudall, P (1998). "Iridaceae: 61 Crocus L.". In Kubitzki, Klaus; Huber, Herbert (eds.). Flowering plants. Monocotyledons: Lilianae (except Orchidaceae). The families and genera of vascular plants. Vol. 3. Berlin: Springer-Verlag. pp. 330–331. ISBN 3-540-64060-6. https://books.google.com/books?id=FyPVYzL76sMC ↩

  139. Mabberley 1997. - Mabberley, D. J. (1997) [1987]. "Crocus". The Plant-Book: A Portable Dictionary of the Vascular Plants (2nd ed.). Cambridge University Press. p. 194. ISBN 978-0-521-41421-0. https://books.google.com/books?id=ZVdoUPtqKCIC ↩

  140. Goldblatt et al 1998, p. 308. - Goldblatt, P; Manning, J C; Rudall, P (1998). "Iridaceae: 61 Crocus L.". In Kubitzki, Klaus; Huber, Herbert (eds.). Flowering plants. Monocotyledons: Lilianae (except Orchidaceae). The families and genera of vascular plants. Vol. 3. Berlin: Springer-Verlag. pp. 330–331. ISBN 3-540-64060-6. https://books.google.com/books?id=FyPVYzL76sMC ↩

  141. Ruksans 2011, p. 17. - Ruksans, Janis (2011). Crocuses: A Complete Guide to the Genus. Timber Press. ISBN 978-1-60469-106-1. https://books.google.com/books?id=3pqFWjcZphMC&pg=PA17 ↩

  142. Heilman 2010, pp. 36–7. - Heilman, Christine, ed. (2010). Simple Steps to Success: Pests and Diseases (US ed.). NY: Royal Horticultural Society; Dorling Kindersley. ISBN 978-0-7566-6996-6. https://books.google.com/books?id=c-loMXA1N_YC ↩

  143. Ruksans 2011, p. 35. - Ruksans, Janis (2011). Crocuses: A Complete Guide to the Genus. Timber Press. ISBN 978-1-60469-106-1. https://books.google.com/books?id=3pqFWjcZphMC&pg=PA17 ↩

  144. Caiola & Faoro 2011. - Caiola, Maria Grilli; Faoro, Franco (2011). "Latent virus infections in Crocus sativus and Crocus cartwrightianus". Phytopathologia Mediterranea. 50 (2): 175–182. JSTOR 26458691. https://www.jstor.org/stable/26458691 ↩

  145. Hill & Hill 2012. - Hill, Lewis; Hill, Nancy (2012) [2003]. "Crocus". The Flower Gardener's Bible: A Complete Guide to Colorful Blooms All Season Long: 400 Favorite Flowers, Time-Tested Techniques, Creative Garden Designs, and a Lifetime of Gardening Wisdom (10th Anniversary ed.). North Adams, MA: Storey Publishing. p. 249. ISBN 978-1-60342-807-1. https://books.google.com/books?id=f_5KHXvqyOYC&pg=PA249 ↩

  146. Ruksans 2011, p. 36. - Ruksans, Janis (2011). Crocuses: A Complete Guide to the Genus. Timber Press. ISBN 978-1-60469-106-1. https://books.google.com/books?id=3pqFWjcZphMC&pg=PA17 ↩

  147. Janick et al 2010. - Janick, Jules; Daunay, Marie Christine; Paris, Harry (November 2010). "Horticulture and Health in the Middle Ages: Images from the Tacuinum Sanitatis". HortScience. 45 (11): 1592–1596. doi:10.21273/HORTSCI.45.11.1592. S2CID 86510163. https://doi.org/10.21273%2FHORTSCI.45.11.1592 ↩

  148. Petersen et al 2008. - Petersen, Gitte; Seberg, Ole; Thorsøe, Sarah; Jørgensen, Tina; Mathew, Brian (2008). "A Phylogeny of the Genus Crocus (Iridaceae) Based on Sequence Data from Five Plastid Regions". Taxon. 57 (2): 487–499. doi:10.2307/25066017. JSTOR 25066017. https://doi.org/10.2307%2F25066017 ↩

  149. Kafi et al 2018. - Kafi, Muhammad; Kamili, Azra N; Husaini, Amjad N; et al. (2018). "An expensive spice saffron (Crocus sativus L.): A Case Study from Kashmir, Iran and Turkey". In Ozturk, Munir; Hakeem, Khalid Rehman; Ashraf, Muhammad; Ahmad, Muhammad Sajid Aqeel (eds.). Global Perspectives on Underutilized Crops. Springer Nature. pp. 109–150. ISBN 978-3-319-77776-4. https://books.google.com/books?id=eC1bDwAAQBAJ ↩

  150. Kafi et al 2018. - Kafi, Muhammad; Kamili, Azra N; Husaini, Amjad N; et al. (2018). "An expensive spice saffron (Crocus sativus L.): A Case Study from Kashmir, Iran and Turkey". In Ozturk, Munir; Hakeem, Khalid Rehman; Ashraf, Muhammad; Ahmad, Muhammad Sajid Aqeel (eds.). Global Perspectives on Underutilized Crops. Springer Nature. pp. 109–150. ISBN 978-3-319-77776-4. https://books.google.com/books?id=eC1bDwAAQBAJ ↩

  151. European Commission 2022. - European Commission (2022). "Krokos Kozanis PDO". Food, Farming, Fisheries: EU Quality Food and Drink. Retrieved 4 January 2022. https://ec.europa.eu/info/food-farming-fisheries/food-safety-and-quality/certification/quality-labels/eu-quality-food-and-drink/krokos-kozanis-pdo_en ↩

  152. Negbi 1999. - Negbi, Moshe, ed. (1999). Saffron: Crocus sativus L. CRC Press. ISBN 978-0-203-30366-5. https://books.google.com/books?id=uLSGgd9sEOUC ↩

  153. Kafi et al 2018. - Kafi, Muhammad; Kamili, Azra N; Husaini, Amjad N; et al. (2018). "An expensive spice saffron (Crocus sativus L.): A Case Study from Kashmir, Iran and Turkey". In Ozturk, Munir; Hakeem, Khalid Rehman; Ashraf, Muhammad; Ahmad, Muhammad Sajid Aqeel (eds.). Global Perspectives on Underutilized Crops. Springer Nature. pp. 109–150. ISBN 978-3-319-77776-4. https://books.google.com/books?id=eC1bDwAAQBAJ ↩

  154. Kafi et al 2018. - Kafi, Muhammad; Kamili, Azra N; Husaini, Amjad N; et al. (2018). "An expensive spice saffron (Crocus sativus L.): A Case Study from Kashmir, Iran and Turkey". In Ozturk, Munir; Hakeem, Khalid Rehman; Ashraf, Muhammad; Ahmad, Muhammad Sajid Aqeel (eds.). Global Perspectives on Underutilized Crops. Springer Nature. pp. 109–150. ISBN 978-3-319-77776-4. https://books.google.com/books?id=eC1bDwAAQBAJ ↩

  155. Trakoli 2021. - Trakoli, Anna (16 June 2021). "Minoan Art, The 'Saffron Gatherers', c1650 BC". Occupational Medicine. 71 (3): 124–126. doi:10.1093/occmed/kqab019. https://doi.org/10.1093%2Foccmed%2Fkqab019 ↩

  156. Palyvou 2005, p. 71. - Palyvou, Clairy (2005). Akrotiri, Thera: An Architecture of Affluence 3,500 Years Old. INSTAP Academic Press (Institute for Aegean Prehistory). ISBN 978-1-62303-068-1. https://books.google.com/books?id=pAQVEAAAQBAJ ↩

  157. Dewan 2015. - Dewan, Rachel (2015). "Bronze Age Flower Power: The Minoan Use and Social Significance of Saffron and Crocus Flowers" (PDF). Chronika. 5: 42–55. http://www.chronikajournal.com/resources/Dewan%202015.pdf ↩

  158. Betancourt 2007. - Betancourt, Philip P. (2007). Introduction to Aegean Art. Philadelphia: INSTAP Academic Press (Institute for Aegean Prehistory). ISBN 978-1-62303-086-5. https://books.google.com/books?id=o4cIEAAAQBAJ ↩

  159. Kafi et al 2018. - Kafi, Muhammad; Kamili, Azra N; Husaini, Amjad N; et al. (2018). "An expensive spice saffron (Crocus sativus L.): A Case Study from Kashmir, Iran and Turkey". In Ozturk, Munir; Hakeem, Khalid Rehman; Ashraf, Muhammad; Ahmad, Muhammad Sajid Aqeel (eds.). Global Perspectives on Underutilized Crops. Springer Nature. pp. 109–150. ISBN 978-3-319-77776-4. https://books.google.com/books?id=eC1bDwAAQBAJ ↩

  160. Palyvou 2005, p. 17. - Palyvou, Clairy (2005). Akrotiri, Thera: An Architecture of Affluence 3,500 Years Old. INSTAP Academic Press (Institute for Aegean Prehistory). ISBN 978-1-62303-068-1. https://books.google.com/books?id=pAQVEAAAQBAJ ↩

  161. Willes 2011, p. 72. - Willes, Margaret (2011). The Making of the English Gardener: Plants, Books and Inspiration, 1560-1660. Yale University Press. ISBN 978-0-300-16382-7. https://books.google.com/books?id=wAxLU3bo3kwC ↩

  162. Willes 2011, p. 169. - Willes, Margaret (2011). The Making of the English Gardener: Plants, Books and Inspiration, 1560-1660. Yale University Press. ISBN 978-0-300-16382-7. https://books.google.com/books?id=wAxLU3bo3kwC ↩

  163. Harris 2022. - Harris, Stephen (2022). "Crocus species (Iridaceae)". Oxford University Plants 400. Department of Plant Sciences, Oxford University. Retrieved 8 January 2022. https://herbaria.plants.ox.ac.uk/bol/plants400/Profiles/cd/crocus ↩

  164. Harvey 1976. - Harvey, John H. (1976). "Turkey as a Source of Garden Plants". Garden History. 4 (3): 21–42. doi:10.2307/1586521. ISSN 0307-1243. JSTOR 1586521. https://www.jstor.org/stable/1586521 ↩

  165. Willes 2011, p. 87. - Willes, Margaret (2011). The Making of the English Gardener: Plants, Books and Inspiration, 1560-1660. Yale University Press. ISBN 978-0-300-16382-7. https://books.google.com/books?id=wAxLU3bo3kwC ↩

  166. Goldgar 2008, p. 22. - Goldgar, Anne (15 September 2008). Tulipmania: Money, Honor, and Knowledge in the Dutch Golden Age. University of Chicago Press. ISBN 978-0-226-30130-3. https://books.google.com/books?id=gViwLbCJ7X0C ↩

  167. Willes 2011, p. 87. - Willes, Margaret (2011). The Making of the English Gardener: Plants, Books and Inspiration, 1560-1660. Yale University Press. ISBN 978-0-300-16382-7. https://books.google.com/books?id=wAxLU3bo3kwC ↩

  168. Willes 2011, p. 204. - Willes, Margaret (2011). The Making of the English Gardener: Plants, Books and Inspiration, 1560-1660. Yale University Press. ISBN 978-0-300-16382-7. https://books.google.com/books?id=wAxLU3bo3kwC ↩

  169. Kamenetsky & Okubo 2012, p. xv. - Kamenetsky, Rina; Okubo, Hiroshi, eds. (2012). Ornamental Geophytes: From Basic Science to Sustainable Production. CRC Press. ISBN 978-1-4398-4924-8. https://books.google.com/books?id=5B-ucdbgA3wC ↩

  170. De Hertogh et al 2012, p. 2. - De Hertogh, August A; van Scheepen, Johan; Le Nard, Marcel; Okubo, Hiroshi; Kamenetsky, Rina (2012). Globalization of the flower bulb industry. CRC Press. pp. 1–16. ISBN 9781439849248. https://books.google.com/books?id=5B-ucdbgA3wC&pg=PA1 ↩

  171. Harris 2022. - Harris, Stephen (2022). "Crocus species (Iridaceae)". Oxford University Plants 400. Department of Plant Sciences, Oxford University. Retrieved 8 January 2022. https://herbaria.plants.ox.ac.uk/bol/plants400/Profiles/cd/crocus ↩

  172. Harris 2022. - Harris, Stephen (2022). "Crocus species (Iridaceae)". Oxford University Plants 400. Department of Plant Sciences, Oxford University. Retrieved 8 January 2022. https://herbaria.plants.ox.ac.uk/bol/plants400/Profiles/cd/crocus ↩

  173. Kafi et al 2018. - Kafi, Muhammad; Kamili, Azra N; Husaini, Amjad N; et al. (2018). "An expensive spice saffron (Crocus sativus L.): A Case Study from Kashmir, Iran and Turkey". In Ozturk, Munir; Hakeem, Khalid Rehman; Ashraf, Muhammad; Ahmad, Muhammad Sajid Aqeel (eds.). Global Perspectives on Underutilized Crops. Springer Nature. pp. 109–150. ISBN 978-3-319-77776-4. https://books.google.com/books?id=eC1bDwAAQBAJ ↩

  174. Viette et al 2015. - Viette, Andre; Viette, Mark; Heriteau, Jacqueline (2015) [2003]. "Crocus". Mid-Atlantic Getting Started Garden Guide: Grow the Best Flowers, Shrubs, Trees, Vines & Groundcovers (Revised ed.). Cool Springs Press. p. 47. ISBN 978-1-59186-435-6. https://books.google.com/books?id=VPf6CwAAQBAJ&pg=PA47 ↩

  175. Ruksans 2011, p. 68. - Ruksans, Janis (2011). Crocuses: A Complete Guide to the Genus. Timber Press. ISBN 978-1-60469-106-1. https://books.google.com/books?id=3pqFWjcZphMC&pg=PA17 ↩

  176. De Hertogh et al 2012, p. 81. - De Hertogh, August A; van Scheepen, Johan; Le Nard, Marcel; Okubo, Hiroshi; Kamenetsky, Rina (2012). Globalization of the flower bulb industry. CRC Press. pp. 1–16. ISBN 9781439849248. https://books.google.com/books?id=5B-ucdbgA3wC&pg=PA1 ↩

  177. Bush-Brown et al 1996. - Bush-Brown, Louise; Bush-Brown, James; Irwin, Howard S. (1996) [1939]. "Crocus Spp. and Cvs.". America's Garden Book. New York: Wiley. p. 388. ISBN 978-0-02-860995-9. https://books.google.com/books?id=2Nk6AQAAIAAJ ↩

  178. Rana 2021. - Rana, Yudhvir (20 June 2021). "Himachal Pradesh set for commercial cultivation of saffron". The Times of India. Retrieved 13 January 2022. https://timesofindia.indiatimes.com/city/shimla/himachal-pradesh-set-for-commercial-cultivation-of-saffron/articleshow/83685219.cms ↩

  179. De Hertogh et al 2012, p. 81. - De Hertogh, August A; van Scheepen, Johan; Le Nard, Marcel; Okubo, Hiroshi; Kamenetsky, Rina (2012). Globalization of the flower bulb industry. CRC Press. pp. 1–16. ISBN 9781439849248. https://books.google.com/books?id=5B-ucdbgA3wC&pg=PA1 ↩

  180. De Hertogh 1992. - De Hertogh, August (1992) [1980]. "Bulbous and tuberous plants". In Larson, Roy A. (ed.). Introduction to Floriculture (2nd ed.). London: Academic Press. pp. 197–223. ISBN 978-1-4832-6998-6. https://books.google.com/books?id=RYDNCgAAQBAJ ↩

  181. Tenenbaum 2003. - Tenenbaum, Frances, ed. (2003). "Crocus". Taylor's Encyclopedia of Garden Plants. Houghton Mifflin Harcourt. pp. 118–119. ISBN 978-0-618-22644-3. https://books.google.com/books?id=557KJL0TC48C&pg=PA118 ↩

  182. Ruksans 2011, p. 20. - Ruksans, Janis (2011). Crocuses: A Complete Guide to the Genus. Timber Press. ISBN 978-1-60469-106-1. https://books.google.com/books?id=3pqFWjcZphMC&pg=PA17 ↩

  183. Burrell & Hardiman 2002. - Burrell, C Colston; Hardiman, Lucy (2002). "Encyclopedia of Spring-Blooming Bulbs: Crocus pp. 68–70". In Hanson, Beth (ed.). Spring-blooming Bulbs: An A to Z Guide to Classic and Unusual Bulbs for Your Spring Garden. 21st-Century Gardening, No. 173. Brooklyn Botanic Garden. pp. 52–100. ISBN 978-1-889538-54-9. https://books.google.com/books?id=AJ4lbhOI13sC&pg=PA70 ↩

  184. Hill & Hill 2012. - Hill, Lewis; Hill, Nancy (2012) [2003]. "Crocus". The Flower Gardener's Bible: A Complete Guide to Colorful Blooms All Season Long: 400 Favorite Flowers, Time-Tested Techniques, Creative Garden Designs, and a Lifetime of Gardening Wisdom (10th Anniversary ed.). North Adams, MA: Storey Publishing. p. 249. ISBN 978-1-60342-807-1. https://books.google.com/books?id=f_5KHXvqyOYC&pg=PA249 ↩

  185. Ruksans 2011, p. 17. - Ruksans, Janis (2011). Crocuses: A Complete Guide to the Genus. Timber Press. ISBN 978-1-60469-106-1. https://books.google.com/books?id=3pqFWjcZphMC&pg=PA17 ↩

  186. Jelitto et al 1990. - Jelitto, Leo; Schacht, Wilhelm; Fessler, Alfred (1990) [1950 Eugen Ulmer, Stuttgart]. "Crocus L. Iridaceae". Hardy Herbaceous Perennials [Die Freiland-Schmuckstauden]. Vol. 1 A–K. trans. Michael E Epp (3rd. ed.). Portland, Oregon: Timber Press. pp. 168–174. ISBN 978-0-88192-159-5. https://books.google.com/books?id=utVnAQAACAAJ ↩

  187. Goldblatt et al 1998, p. 314. - Goldblatt, P; Manning, J C; Rudall, P (1998). "Iridaceae: 61 Crocus L.". In Kubitzki, Klaus; Huber, Herbert (eds.). Flowering plants. Monocotyledons: Lilianae (except Orchidaceae). The families and genera of vascular plants. Vol. 3. Berlin: Springer-Verlag. pp. 330–331. ISBN 3-540-64060-6. https://books.google.com/books?id=FyPVYzL76sMC ↩

  188. Harpke et al 2013. - Harpke, Dörte; Meng, Shuchun; Rutten, Twan; Kerndorff, Helmut; Blattner, Frank R. (March 2013). "Phylogeny of Crocus (Iridaceae) based on one chloroplast and two nuclear loci: Ancient hybridization and chromosome number evolution". Molecular Phylogenetics and Evolution. 66 (3): 617–627. Bibcode:2013MolPE..66..617H. doi:10.1016/j.ympev.2012.10.007. PMID 23123733. https://ui.adsabs.harvard.edu/abs/2013MolPE..66..617H ↩

  189. Trakoli 2021. - Trakoli, Anna (16 June 2021). "Minoan Art, The 'Saffron Gatherers', c1650 BC". Occupational Medicine. 71 (3): 124–126. doi:10.1093/occmed/kqab019. https://doi.org/10.1093%2Foccmed%2Fkqab019 ↩

  190. Dewan 2015. - Dewan, Rachel (2015). "Bronze Age Flower Power: The Minoan Use and Social Significance of Saffron and Crocus Flowers" (PDF). Chronika. 5: 42–55. http://www.chronikajournal.com/resources/Dewan%202015.pdf ↩

  191. Day 2011. - Day, Jo (2011). "Crocuses in context: A Diachronic Survey of the Crocus Motif in the Aegean Bronze Age". Hesperia: The Journal of the American School of Classical Studies at Athens. 80 (3): 337. doi:10.2972/hesperia.80.3.0337. S2CID 165105395. https://doi.org/10.2972%2Fhesperia.80.3.0337 ↩

  192. De Hertogh et al 2012, pp. 3–4. - De Hertogh, August A; van Scheepen, Johan; Le Nard, Marcel; Okubo, Hiroshi; Kamenetsky, Rina (2012). Globalization of the flower bulb industry. CRC Press. pp. 1–16. ISBN 9781439849248. https://books.google.com/books?id=5B-ucdbgA3wC&pg=PA1 ↩

  193. Smith 1859, pp. 214, 384, 856, 892. - Smith, William, ed. (1859). A Dictionary of Greek and Roman Antiquities (2nd. ed.). Boston: Little, Brown and Company. https://books.google.com/books?id=LscPAAAAYAAJ ↩

  194. Smith 1859, pp. 369–370. - Smith, William, ed. (1859). A Dictionary of Greek and Roman Antiquities (2nd. ed.). Boston: Little, Brown and Company. https://books.google.com/books?id=LscPAAAAYAAJ ↩

  195. Smith 1859, p. 1214. - Smith, William, ed. (1859). A Dictionary of Greek and Roman Antiquities (2nd. ed.). Boston: Little, Brown and Company. https://books.google.com/books?id=LscPAAAAYAAJ ↩

  196. Lehner & Lehner 2003. - Lehner, Ernst; Lehner, Johanna (2003) [1960 Tudor Publishing]. "The Crocus". Folklore and Symbolism of Flowers, Plants and Trees. Courier Corporation. p. 56. ISBN 978-0-486-42978-6. https://books.google.com/books?id=E1MsNIoiFOcC&pg=PA56 ↩

  197. Schmitz 1850. - Schmitz, Leonhard (1850). "Crocus". In Smith, William (ed.). Dictionary of Greek and Roman Biography and Mythology 2 vols. Vol. I: Abaeus-Dysponteus. London: Taylor and Walton. p. 896. https://books.google.com/books?id=GoUOAAAAQAAJ&pg=P896 ↩

  198. European Commission 2022. - European Commission (2022). "Krokos Kozanis PDO". Food, Farming, Fisheries: EU Quality Food and Drink. Retrieved 4 January 2022. https://ec.europa.eu/info/food-farming-fisheries/food-safety-and-quality/certification/quality-labels/eu-quality-food-and-drink/krokos-kozanis-pdo_en ↩

  199. FIFA 2018. - FIFA (14 December 2018). "Emblem and match schedule for Poland 2019 unveiled". Tournaments. FIFA. Retrieved 14 January 2022. https://www.fifa.com/tournaments/mens/u20worldcup/fifa-u-20-world-cup-poland-2019/news/emblem-and-match-schedule-for-poland-2019-unveiled ↩