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Allium robinsonii
''Allium robinsonii'', the Columbia River Onion or Robinson's onion, is a rare plant species native to the US States of Washington and Oregon, although some studies suggest that the Oregon populations may now be extinct. The species has been reported from 5 counties in Washington (Ferry, Yakima, Grant, Franklin and Benton) and 5 in Oregon (Umatilla, Morrow, Gilliam, Sherman and Wasco). It is found in sand and gravel deposits along the lower Columbia River and some of its tributaries, usually at elevations less than 200 m.〔(Flora of North America v 26 p 276, ''Allium robinsonii'' )〕〔(BONAP (Biota of North America Project) floristic synthesis, ''Allium robinsonii'' )〕〔(Wildflowers, Turner Photographics, Mike Turner, 2013 )〕 The species is also cultivated as an ornamental in other regions, including in Europe.〔(Gardening Europe, ''Allium robinsonii'' )〕
''Allium robinsonii'' produces 1-3 egg-shaped bulbs up to 2 cm long, but no underground rhizomes. Flowering stalks are relatively short for the genus, rarely more than 8 cm tall. Flowers are bell-shaped, up to 9 mm across; tepals white to pale pink with red midrib; anthers purple; pollen yellow or gray; ovary crested. The plant is named in honor of B.L. Robinson of the Gray Herbarium of Harvard University.〔〔(Henderson, Louis Forniquet. 1930. Rhodora 32(374): 22. )〕〔(photo of herbarium specimen at Missouri Botanical Garden, isotype of ''Allium robinsonii'' )〕〔Hitchcock, C. H., A.J. Cronquist, F. M. Ownbey & J. W. Thompson. 1969. Vascular Cryptogams, Gymnosperms, and Monocotyledons. 1: 1–914. In C. L. Hitchcock, Vascular Plants of the Pacific Northwest. University of Washington Press, Seattle.〕〔(Onions East of the Cascade Mountains, Paul Schlichter, Robinson's onion, 2007 )〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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