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Coleogyne
''Coleogyne ramosissima'' or blackbrush, is a low lying, dark grayish-green, aromatic,〔Turner, Raymond M. 1982. Great Basin desertscrub. In: Brown, David E., ed. Biotic communities of the American Southwest--United States and Mexico. Desert Plants. 4(1-4): 145-155.〕 spiny, perennial, soft wooded〔 shrub, native to the deserts of the southwestern United States.〔Mojave Desert Wildflowers, Pam MacKay, p18, 252〕〔Canyon Country Wildflowers, Damian Fagan, p 3, 105〕 It is called blackbrush because the gray branches darken when wet by rains.〔〔 It is in the rose family (Rosaceae),〔〔 and is the only species in the monotypic genus ''Coleogyne''.
==Growth pattern==
It has dense, intricate branches ("ramosissima" means "many branched").〔 Its dense branches form spiny tips.〔 This plant forms vast pure stands across the desert floor and on scrubby slopes, giving the landscape a uniform dark-gray color.〔 Vegetative types in which it dominates or is a codominate are called blackbrush scrub.〔〔
It drops most of its leaves and becomes dormant in conditions of severe dryness (drought-deciduous), but some leaves are usually retained at the end of the branches.〔 The thickly branched plant forms thickets which may spread across the ground in clumps or grow erect to approach six feet in height in the Mojave Desert,〔 and 4 feet in the Canyonlands desert region.〔
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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