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''Toxicoscordion'' is a genus of flowering plants in the family Melanthiaceae, tribe Melanthieae, first described as a genus in 1903.〔(Rydberg, Per Axel. 1903. Bulletin of the Torrey Botanical Club 30(5): 272–273 ) in English〕〔(Tropicos, ''Toxicoscordion'' Rydb. )〕 The genus is mainly distributed in the midwestern United States and western North America, with some species in western Canada and northern Mexico.〔(Kew World Checklist of Selected Plant Families )〕〔 Molecular phylogenetic studies in the 21st century have resulted in number of changes to placements within this tribe. ''Toxicoscordion'' was long submerged into the genus ''Zigadenus'', but its separate position in the phylogeny of the Melanthieae has been confirmed. Members of ''Toxicoscordion'' may also be distinguished from other similar members of the deathcamas tribe by the presence of narrow, clawed tepals with a single, conspicuous, rounded gland. ;Species〔〔(Biota of North America Program 2013 county distribution maps )〕 # ''Toxicoscordion brevibracteatum'' (syn. ''Zigadenus brevibracteatus'') - desert deathcamas - Baja California, Sonora, California # ''Toxicoscordion exaltatum'' (syn. ''Zigadenus exaltatus'') - giant deathcamas - California, Nevada # ''Toxicoscordion fontanum'' (syn. ''Zigadenus fontanus'') - smallflower deathcamas - California # ''Toxicoscordion fremontii'' (syn. ''Zigadenus fremontii'') - Frèmont's deathcamas, star zigadene (several varieties) - Baja California, Oregon, California # ''Toxicoscordion micranthum'' (syn. ''Zigadenus micranthus'') - smallflower deathcamas - Oregon, California # ''Toxicoscordion nuttallii'' (syn. ''Zigadenus nuttallii'') - Nuttall's deathcamas - SC USA # ''Toxicoscordion paniculatum'' (syn. ''Zigadenus paniculatus'') - foothill deathcamas, sand-corn - W USA # ''Toxicoscordion venenosum'' (syn. ''Zigadenus venenosus'') - death camas, meadow deathcamas - W Canada, W USA, Baja California ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Toxicoscordion」の詳細全文を読む スポンサード リンク
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