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Pistia
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<h2 id="description">Description</h2> <p><i>Pistia stratiotes</i> is a <a href="/facts/Perennial_plant/MQ3NvAUW">perennial</a> <a href="/facts/Monocotyledon/mXCuuCYo">monocotyledon</a> with thick, soft leaves that form a rosette.<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a> It floats on the surface of the water, its roots hanging submersed beneath floating leaves. The leaves can measure 2 – 15 cm long and are light green, with parallel venations and wavy margins.<a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a> The surface of the leaves is covered in short, white hairs which form basket-like structures that can trap air bubbles and increase the plant's buoyancy. The spongy parenchyma with large intercellular spaces in the leaves also aids the plant in floating.<a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a> The <a href="/facts/Flower/7gI5Kefw">flowers</a> are <a href="/facts/Plant_sexuality/Up20kQT3">dioecious</a>, lack petals, and are hidden in the middle of the plant amongst the leaves. <i>Pistia stratiotes</i> has a spadix inflorescence, containing one pistillate flower with one ovary and 2–8 staminate flowers with two stamens.<a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a> The pistillate and carpellate flowers are separated by folds in the spathe, where the male flowers are located above the female flowers.<a class="footnote-ref" id="fnref:8" href="#fn:8"><sup>8</sup></a> Oval, green berries with ovoid seeds form after successful fertilization. The plant undergoes <a href="/facts/Asexual_reproduction/HpovW0VS">asexual reproduction</a> by propagating through stolons, yet evidence of sexual reproduction has also been observed in the ponds of Southern Brazil.<a class="footnote-ref" id="fnref:9" href="#fn:9"><sup>9</sup></a> </p><p><i>Pistia stratiotes</i> are found in slow-moving rivers, lakes, and ponds. The species displays optimal growth in the temperature range of 22–30 °C, but can endure extreme temperatures up to 35 °C.<a class="footnote-ref" id="fnref:10" href="#fn:10"><sup>10</sup></a> As a result, <i>Pistia</i> <i>stratiotes</i> do not grow in colder temperatures, beyond the tropics of Cancer and Capricorn. The species also require slightly acidic water in the pH range of 6.5–7.2 for optimal growth.<a class="footnote-ref" id="fnref:11" href="#fn:11"><sup>11</sup></a> </p> <h2 id="invasion">Invasion</h2> <p>Water lettuce is among the world's most productive freshwater aquatic plants and is considered an <a href="/facts/Invasive_species/Ya1v6RGx">invasive species</a>.<a class="footnote-ref" id="fnref:12" href="#fn:12"><sup>12</sup></a> The species can be introduced to new areas by water dispersal, fragmentation, and hitchhiking on marine transportation or fishing equipment.<a class="footnote-ref" id="fnref:13" href="#fn:13"><sup>13</sup></a> The invasion of <i>Pistia stratiotes</i> in the ecosystem can lead to environmental and socio-economic ramifications to the community it serves. In waters with high nutrient content, particularly those that have been contaminated with human loading of sewage or fertilizers, water lettuce can exhibit weedy overgrowth. It may also become invasive in hydrologically altered systems such as flood control canals and reservoirs.<a class="footnote-ref" id="fnref:14" href="#fn:14"><sup>14</sup></a> The severe overgrowth of water lettuce can block gas exchange in the surface water, creating hypoxic conditions and eliminating or disrupting various native marine organisms.<a class="footnote-ref" id="fnref:15" href="#fn:15"><sup>15</sup></a> Blocking access to sunlight, large mats of water lettuce can shade native submerged plants and alter communities relying on these native plants as a source of food.<a class="footnote-ref" id="fnref:16" href="#fn:16"><sup>16</sup></a> The growth of these mats can also get tangled in boat propellers and create challenges for boaters or recreational fishermen.<a class="footnote-ref" id="fnref:17" href="#fn:17"><sup>17</sup></a> </p><p><i>Pistia stratiotes</i> feature in the life cycles of certain insect vectors for <a href="/facts/Malaria/rN3g58CX">malaria</a> and <a href="/facts/Filariasis/8AkVK5hy">filariasis</a>.<a class="footnote-ref" id="fnref:18" href="#fn:18"><sup>18</sup></a> Mosquitoes of the genus <i><a href="/facts/Mansonia_(fly)/SThLaGvX">Mansonia</a></i> can lay their eggs under the leaves of aquatic plants, such as <i>Pistia stratiotes.</i> Twenty-four hours later, the emerging larvae attach to the plant's roots using its siphon tube for respiration. Within a week, larvae can develop into adult mosquitos, making <i>Pistia stratiotes</i> a potential breeding ground for vectors of infectious disease.<a class="footnote-ref" id="fnref:19" href="#fn:19"><sup>19</sup></a> The moth <i><a href="/facts/Samea_multiplicalis/cwBlc4Wm">Samea multiplicalis</a></i> also uses <i>Pistia stratiotes</i> as its primary host plant. Eggs are laid among leaves and stems of the host plant and larvae hatch and feed intensively as they develop.<a class="footnote-ref" id="fnref:20" href="#fn:20"><sup>20</sup></a> </p> <h3>Control</h3> <ol><li>Chemical control: Herbicides have been effective in controlling <i>Pistia stratiotes:</i> diquat, glyphosate, terbutryn, 2,4-D, among many others.<a class="footnote-ref" id="fnref:21" href="#fn:21"><sup>21</sup></a> Yet, the use of herbicides must be critically assessed to prevent negative environmental impacts and possible toxic effects on marine life and human health.<a class="footnote-ref" id="fnref:22" href="#fn:22"><sup>22</sup></a></li> <li>Physical control: <i>Pistia stratiotes</i> can be controlled with mechanical harvesters that remove the water lettuce from the infested waters and transport it to disposal onshore.<a class="footnote-ref" id="fnref:23" href="#fn:23"><sup>23</sup></a> Larger infestations can be removed with the aid of hydraulic excavators and tractors. To prevent the re-growth of <i>Pistia stratiotes</i> colonies, a long-term maintenance program should be implemented.</li> <li>Biological control: Two species of <a href="/facts/Insect/IgDNvnUL">insects</a> are also being used as a <a href="/facts/Biological_control/khkjgaQw">biological control</a>. Adults and larvae of the <a href="/facts/South_America/PhrFEMk7">South American</a> <a href="/facts/Weevil/GysFUkFv">weevil</a> <i>Neohydronomous affinis</i> feed on <i>Pistia</i> leaves, as do the larvae of the moth <i><a href="/facts/Spodoptera_pectinicornis/HlWGNpdQ">Spodoptera pectinicornis</a></i> from <a href="/facts/Thailand/GCUnN4JK">Thailand</a>.<a class="footnote-ref" id="fnref:24" href="#fn:24"><sup>24</sup></a><a class="footnote-ref" id="fnref:25" href="#fn:25"><sup>25</sup></a> Both are proving to be useful tools in the management of <i>Pistia</i> <i>stratiotes</i> through the experimental recovery of benthic communities with hypoxic conditions.<a class="footnote-ref" id="fnref:26" href="#fn:26"><sup>26</sup></a></li></ol> <p>The species is set to be banned in the EU from August of 2024 to prevent spreading.<a class="footnote-ref" id="fnref:27" href="#fn:27"><sup>27</sup></a> </p> <h2 id="range">Range</h2> <p>The center of origin of <i>Pistia stratiotes</i> has long been a source of debate.<a class="footnote-ref" id="fnref:28" href="#fn:28"><sup>28</sup></a> Nativity to northern Africa is indicated by <a href="/facts/Egyptian_hieroglyphics/qXRpprLe">Egyptian hieroglyphics</a> and reports of plants meeting the description of <i>Pistia</i> by Greek botanists, <a href="/facts/Pedanius_Dioscorides/FzDmURv3">Dioscorides</a> and <a href="/facts/Theophrastus/YEeQeInW">Theophrastus</a> in the <a href="/facts/Nile/vGoXVUFH">Nile</a> River.<a class="footnote-ref" id="fnref:29" href="#fn:29"><sup>29</sup></a> In addition, the co-evolution of <i>Pistia stratiotes</i> with various insects native to Brazil and Argentina, such as the water lettuce weevil,<a class="footnote-ref" id="fnref:30" href="#fn:30"><sup>30</sup></a> indicates a long-term native tenure in South America.<a class="footnote-ref" id="fnref:31" href="#fn:31"><sup>31</sup></a> Fossil specimens dating back to the late <a href="/facts/Pleistocene/0ya9eUp5">Pleistocene</a> (~12,000 <a href="/facts/Before_Present/BywUcMvW">BP</a>) and early <a href="/facts/Holocene/sppPgwW5">Holocene</a> (~3,500 BP) period are reported from Florida, indicating a native presence in the southeastern United States.<a class="footnote-ref" id="fnref:32" href="#fn:32"><sup>32</sup></a> Recent genetic evidence also suggests that <i>Pistia</i> is not actually a monotypic genus, as had been long assumed.<a class="footnote-ref" id="fnref:33" href="#fn:33"><sup>33</sup></a> Instead, <i>Pistia</i> appears to be composed of at least three genetically distinct, but morphologically and ecologically similar, species at a global scale.<a class="footnote-ref" id="fnref:34" href="#fn:34"><sup>34</sup></a> </p> <h3>Temperate occurrences</h3> <p>Though <i>Pistia stratiotes</i> is intolerant of cold temperatures, it has been recorded growing at least temporarily in temperate areas of North America and Europe.<a class="footnote-ref" id="fnref:35" href="#fn:35"><sup>35</sup></a><a class="footnote-ref" id="fnref:36" href="#fn:36"><sup>36</sup></a> In the United States north of the Gulf of Mexico it has been found growing in Colorado, Connecticut, Delaware, Illinois, Kansas, Maryland, Michigan, Minnesota, Missouri, New York, North Carolina, Ohio, Rhode Island, South Carolina, and Wisconsin. One of these occurrences, in Idaho, survives in an area of a river fed by a hot spring. The rest are thought either to be completely eradicated by cold weather or possibly to survive by seed production.<a class="footnote-ref" id="fnref:37" href="#fn:37"><sup>37</sup></a> </p> <h2 id="fossil-record">Fossil record</h2> <p><i>Pistia</i>-like plants appear in the <a href="/facts/Fossil/by7NzIA1">fossil</a> record during the <a href="/facts/Late_Cretaceous/pcHa4fBg">Late Cretaceous</a> epoch in rock <a href="/facts/Stratum/w5D4VAwa">strata</a> from the western interior of North America. They were first described as †<i>Pistia corrugata</i> by <a href="/facts/Leo_Lesquereux/b4lfcEuK">Leo Lesquereux</a> in 1876 based on specimens from the <a href="/facts/Almond_Formation/wDjSn8HI">Almond Formation</a> of <a href="/facts/Wyoming/kuKmWryL">Wyoming</a> (late <a href="/facts/Campanian/MoPSxcqL">Campanian</a> age). However, based on more complete specimens from the Campanian <a href="/facts/Dinosaur_Park_Formation/fJwQPd31">Dinosaur Park Formation</a> of southern <a href="/facts/Alberta/PjKJFbJY">Alberta</a>, <a href="/facts/Canada/cWWFM8oc">Canada</a>, and other areas, they were redescribed as a separate <a href="/facts/Genus/m8EFjSms">genus</a>, †<i>Cobbania</i>, primarily due to differences in leaf morphology.<a class="footnote-ref" id="fnref:38" href="#fn:38"><sup>38</sup></a><a class="footnote-ref" id="fnref:39" href="#fn:39"><sup>39</sup></a> Younger fossils attributed to <i>Pistia</i> <i>stratiotes</i> have described from <a href="/facts/Eocene/EYgI8Uco">Eocene</a> strata in the <a href="/facts/Southeastern_United_States/jlyYnNvo">southeastern United States</a>,<a class="footnote-ref" id="fnref:40" href="#fn:40"><sup>40</sup></a> and 350 <a href="/facts/Fossil/by7NzIA1">fossil</a> <a href="/facts/Seeds/a4xGSLxJ">seeds</a> of †<i>Pistia sibirica</i> have been described from middle Miocene strata of the Fasterholt area near <a href="/facts/Silkeborg/bIANWesW">Silkeborg</a> in <a href="/facts/Central_Jutland/7YNBnjes">Central Jutland</a>, <a href="/facts/Denmark/KVtykzsw">Denmark</a>. Fossils of this species have also been described from the <a href="/facts/Oligocene/n3gnNogo">Oligocene</a> and Miocene of <a href="/facts/Western_Siberia/a78KWgJd">Western Siberia</a> and from the Miocene of <a href="/facts/Germany/paluuWBX">Germany</a>.<a class="footnote-ref" id="fnref:41" href="#fn:41"><sup>41</sup></a> </p><p>A specimen of <i>Pistia</i> from the <a href="/facts/Florida/cF245A3Q">Florida</a> peninsula dating from at least 3,550 years <a href="/facts/Before_Present/BywUcMvW">Before Present</a> and a report of <a href="/facts/Holocene/sppPgwW5">Holocene</a> <i>Pistia</i> fossils from a lake in south central Florida are consistent with genetic evidence indicating that some varieties of <i>Pistia stratiotes</i> are native to the southeastern United States.<a class="footnote-ref" id="fnref:42" href="#fn:42"><sup>42</sup></a><a class="footnote-ref" id="fnref:43" href="#fn:43"><sup>43</sup></a><a class="footnote-ref" id="fnref:44" href="#fn:44"><sup>44</sup></a> </p> <h2 id="uses">Uses</h2> <h3>Consumption</h3> <p>While considered edible, <i>Pistia stratiotes</i> is not palatable as it is rich in <a href="/facts/Calcium_oxalate/1NC8NQ01">calcium oxalate</a> crystals that are bitter in taste. Nevertheless, there are records of the plant being utilized as famine food in India during the <a href="/facts/Great_Famine_of_1876%E2%80%931878/LtLgoQnd">Great Famine of 1876–1878</a>.<a class="footnote-ref" id="fnref:45" href="#fn:45"><sup>45</sup></a> </p><p>The <a href="/facts/Hausa_people/pIw7h5Qx">Hausa</a> people of Nigeria used the ash of the plant as a substitute for salt due to its high concentration of potassium chloride, a mineral salt.<a class="footnote-ref" id="fnref:46" href="#fn:46"><sup>46</sup></a> This salt substitute, also called <i>zakankau</i>, was of high importance, especially when imported salt was unavailable.<a class="footnote-ref" id="fnref:47" href="#fn:47"><sup>47</sup></a> </p><p>Caution is advised when consuming <i>Pistia stratiotes</i>, as the plant is a <a href="/facts/Hyperaccumulator/2YrgVQUY">hyperaccumulator</a>, and can absorb and accumulate toxic heavy metals present in its environment.<a class="footnote-ref" id="fnref:48" href="#fn:48"><sup>48</sup></a> The presence of high concentrations of calcium oxalate crystals can induce various health concerns, such as inhibited mineral absorption and kidney stones.<a class="footnote-ref" id="fnref:49" href="#fn:49"><sup>49</sup></a><a class="footnote-ref" id="fnref:50" href="#fn:50"><sup>50</sup></a> </p><p>In Singapore and Southern China, <i>Pistia stratiotes</i> is commonly grown or collected as animal feed for ducks and pigs.<a class="footnote-ref" id="fnref:51" href="#fn:51"><sup>51</sup></a> Water lettuce is also considered an alternative for poultry feed in Indonesia due to its high content of crude protein.<a class="footnote-ref" id="fnref:52" href="#fn:52"><sup>52</sup></a> </p> <h3>Medical treatment</h3> <p>There are various medical uses of <i>Pistia stratiotes</i> throughout regions in Asia and Africa. In Nigeria, the dried leaves are prepared into a powder form and are applied to wounds and sores <a href="/facts/Disinfectant/33fF2QzG">for disinfection</a>.<a class="footnote-ref" id="fnref:53" href="#fn:53"><sup>53</sup></a> A similar use is present in <a href="/facts/Ayurveda/XCgFAdb3">Indian traditional medicine</a>, where the powdered leaf is applied to <a href="/facts/Syphilitic/fdnGLyLT">syphilitic</a> eruptions and <a href="/facts/Skin_infections/UWn7FHFT">skin infections</a>.<a class="footnote-ref" id="fnref:54" href="#fn:54"><sup>54</sup></a> In <a href="/facts/Nigeria/gbW17BX8">Nigeria</a> and <a href="/facts/Gambia/en5tl7Sz">Gambia</a>, the leaf is infused in water to create an <a href="/facts/Eyewash/JKLGDweX">eyewash</a> to treat <a href="/facts/Allergic_conjunctivitis/5xwNBMUe">allergic conjunctivitis</a>.<a class="footnote-ref" id="fnref:55" href="#fn:55"><sup>55</sup></a> The eyewash is known to have a cooling and <a href="/facts/Analgesic/xLj4XBcq">analgesic</a> effect. Therefore, the plant is commonly called 'eye-pity' in Africa.<a class="footnote-ref" id="fnref:56" href="#fn:56"><sup>56</sup></a> In addition, the leaves of <i>Pistia stratiotes</i> can be burned into <a href="/facts/Ash/zG3qeoIq">ash</a>, and in Indian and Nigerian traditional medicine, the ash is used in treating <a href="/facts/Dermatophytosis/hFyb8T6n">ringworm</a> infections of the <a href="/facts/Scalp/yfnQt0n5">scalp</a>.<a class="footnote-ref" id="fnref:57" href="#fn:57"><sup>57</sup></a> </p> <h4>Medicinal properties</h4> <ul><li>Anti-inflammatory properties: Extractions of the leaves of <i>P. stratiotes</i> reduces mast infiltration and degranulation in allergic reactions and presents <a href="/facts/Anti-inflammatory/W27poSUd">anti-inflammatory</a> properties.<a class="footnote-ref" id="fnref:58" href="#fn:58"><sup>58</sup></a><a class="footnote-ref" id="fnref:59" href="#fn:59"><sup>59</sup></a> The ethanolic extracts have also been positively correlated with a reduction in inflammatory disorders, such as <a href="/facts/Arthritis/IQ1wyf21">arthritis</a> and <a href="/facts/Fever/waVxR2Ac">fevers</a>.<a class="footnote-ref" id="fnref:60" href="#fn:60"><sup>60</sup></a></li> <li>Antifungal properties: With the popular use of <i>Pistia stratiotes</i> as a traditional treatment for ringworms, researchers have tested <i>P. stratiotes</i> methanolic extracts on <a href="/facts/Dermatophyte/tBWYEhTN">dermatophyte</a> fungi. The results of the studies depicted significant <a href="/facts/Fungicide/c1twQBYo">fungicidal</a> activity on <i><a href="/facts/Trichophyton_rubrum/wXXg74Yt">T. rubrum</a></i>, <i>T. mentagrophytes</i>, and <i><a href="/facts/Epidermophyton_floccosum/SAY9JIqn">E. floccosum</a></i>.<a class="footnote-ref" id="fnref:61" href="#fn:61"><sup>61</sup></a><a class="footnote-ref" id="fnref:62" href="#fn:62"><sup>62</sup></a></li></ul> <h3>Environmental remediation</h3> <p>The high sorption property of water lettuce makes it a great candidate for biodegradable oil sorbents in marine oil spills. Particularly, the leaves of <i>Pistia</i> <i>stratiotes</i> can efficiently absorb significant amounts of hydrocarbons due to its large surface area and hydrophobicity.<a class="footnote-ref" id="fnref:63" href="#fn:63"><sup>63</sup></a> </p><p>As a hyper-accumulator, <i>Pistia</i> <i>stratiotes</i> has been studied as a potential candidate for <a href="/facts/Wastewater_treatment/b5bJ6aJm">wastewater treatment</a> plants. The roots and leaves of the plant have been found to absorb excess nutrients and heavy metals, such as <a href="/facts/Zinc/80b1qgk3">zinc</a>, <a href="/facts/Chromium/6sVk6Uu7">chromium</a>, and <a href="/facts/Cadmium/wXkV2eIX">cadmium</a> in contaminated waters.<a class="footnote-ref" id="fnref:64" href="#fn:64"><sup>64</sup></a> </p><p><i>Pistia</i> <i>stratiotes</i> can be grown in water gardens to reduce <a href="/facts/Harmful_algal_bloom/Nj8DA7YE">harmful algal blooms</a> and eutrophic conditions.<a class="footnote-ref" id="fnref:65" href="#fn:65"><sup>65</sup></a> The plant is able to control the growth of algae by restricting light penetration in the water column and competing for nutrients, with significant uptake of <a href="/facts/Phosphorus/27xCeIqs">phosphorus</a> and <a href="/facts/Ammonia/MtLtJFtz">ammonia</a> nitrogen.<a class="footnote-ref" id="fnref:66" href="#fn:66"><sup>66</sup></a> </p> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/Phytoremediation/x0MEunE0">Phytoremediation plants</a></li> <li><a href="/facts/Hyperaccumulators_table_%E2%80%93_3/2aImeEMd">Hyperaccumulators table – 3</a></li></ul> <a href="/facts/Wikispecies/b2GhA7Le">Wikispecies</a> has information related to <i>Pistia stratiotes</i>. <ul><li><a href="https://web.archive.org/web/20151125205618/http://sysbio.oxfordjournals.org/content/53/3/422.full">"Biogeography of the Pistia clade (Araceae): Based on chloroplast and mitochondrial DNA sequences and Bayesian divergence time inference"</a></li></ul> <h2 id="external-links">External links</h2> <ul><li> Media related to Pistia stratiotes at Wikimedia Commons</li> <li><a href="https://web.archive.org/web/20041010052138/http://aquat1.ifas.ufl.edu/pistpic.html">Centre for Aquatic and Invasive Plants</a></li> <li><a href="http://www.hear.org/species/pistia_stratiotes/"><i>Pistia stratiotes</i> information</a> from the <a href="http://www.hear.org/">Hawaiian Ecosystems at Risk project (HEAR)</a></li> <li><a href="https://www.invasivespeciesinfo.gov/profile/water-lettuce">Species Profile- Water Lettuce (<i>Pistia stratiotes</i>)</a>, National Invasive Species Information Center, <a href="/facts/United_States_National_Agricultural_Library/hohXT8HC">United States National Agricultural Library</a>. Lists general information and resources for Water Lettuce.</li> <li><a href="http://www.westafricanplants.senckenberg.de/root/index.php?page_id=13&preview=true&searchTextMenue=Pistia+stratiotes&search=Wikitemplate"><i>Pistia stratiotes</i></a> in <a href="http://www.westafricanplants.senckenberg.de/">West African plants – A Photo Guide.</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Buzgo, Matyas (1994). "Inflorescence development of Pistia stratiotes (Araceae)". Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie. 115 (1): 557. doi:10.1186/1999-3110-55-30. PMC 5432749. PMID 28510972. <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5432749" target="_blank">https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5432749</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Khare, C.P. (2007). "Pistia stratiotes Linn. Var. Cuneata Engl". Indian Medicinal Plants. p. 1. doi:10.1007/978-0-387-70638-2_1218. 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