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Allium rhizomatum
''Allium rhizomatum'' is a species of plant native to southern Arizona (Cochise and Santa Cruz Counties), southern New Mexico (Catron, Grant, Hidalgo, Socorro, Sierra and Eddy Counties) and western Texas (Brewster and Jeff Davis Counties) in the United States, and Chihuahua in Mexico. It is generally found in dry, grassy areas at elevations of 1200–2200 m.〔(Flora of North America, v 26 p 258, ''Allium rhizomatum'' )〕〔(BONAP (Biota of North America Project) floristic synthesis, ''Allium rhizomatum'' )〕 Its common names include spreading wild onion〔(''Allium rhizomatum''. ) Chihuahuan Desert Plants. Centennial Museum. University of Texas, El Paso.〕 and red flower onion.〔(''Allium rhizomatum''. ) Plant Abstracts. Arizona Game and Fish Department.〕
''Allium rhizomatum'' spreads by means of underground rhizomes, with new bulbs forming as much as 3 cm away from the parent plant. Bulbs are narrowly ellipsoid, up to 3 cm long but rarely more than 1 cm across. Flowers are up to 10 mm across; tepals white with red central veins, without glands; ovary oblong to elongate, lacking a crest; anthers yellow or pink; pollen yellow or white.〔〔(Wooton, Elmer Ottis & Standley, Paul Carpenter. 1913. Contributions from the United States National Herbarium 16(4): 114. )〕〔Correll, D. S. & M. C. Johnston. 1970. Manual of the Vascular Plants of Texas i–xv, 1–1881. The University of Texas at Dallas, Richardson.〕〔
Some authors have considered ''A. rhizomatum'' to be the same species as ''A. glandulosum'' found in central and southern Mexico, but this latter species has deep red flowers, a rounded ovary and glands on the sepals.〔
==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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