Peraphyllum ramosissimum is a shrub which may reach 3 metres (10 ft) in height.1 Growing up to 3.5 centimetres (1+1⁄2 in) long,2 the leaves are simple; they can grow very close together on short shoots but are well separated on longer shoots.3
Like most other flowering plants of the Rosaceae, P. ramosissimum has 5 petals and 5 sepals with radial symmetry. The flowers have about 15–20 free stamens, and the petals are white to rose in color. The fruit is a yellowish to purplish pome about 1 centimetre (1⁄2 in) wide.4
Translated from the Greek, the genus Peraphyllum means "very leafy" and the species name ramosissimum means "many branches". Peraphyllum is most closely related to Amelanchier, Malacomeles, Crataegus, and Mespilus.5
Peraphyllum ramosissimum grows in Washington, California, Oregon,6 Idaho, Utah, Colorado, and New Mexico, usually in pine and juniper woodlands.7 In California it can be found in the High Cascades, High Sierra Nevada, Great Basin, and Mojave Desert sky islands.
The ripe pome is edible and sweetish but has a bitter aftertaste.8
Turner, Mark; Kuhlmann, Ellen (2014). Trees & Shrubs of the Pacific Northwest (1st ed.). Portland, OR: Timber Press. p. 248. ISBN 978-1-60469-263-1. 978-1-60469-263-1 ↩
Janene Auger and Justin G. Smith, Peraphyllum ramosissimum Nutt., squaw-apple in Woody Plant Seed Manual Interim Web Site Archived 2009-02-19 at the Wayback Machine http://www.nsl.fs.fed.us/wpsm/Peraphyllum.pdf ↩
Campbell, C.S.; Evans, R.C.; Morgan, D.R.; Dickinson, T.A.; Arsenault, M.P. (2007). Phylogeny of subtribe Pyrinae (formerly the Maloideae, Rosaceae): Limited resolution of a complex evolutionary history. Plant Systematics and Evolution. 266(1–2): 119–145. ↩