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''Triantha'' is a small genus of flowering plants in the family Tofieldiaceae, first described as a genus in 1879.〔(Baker, John Gilbert. 1879. Journal of the Linnean Society, Botany 17(2): 490-491 ) in Latin〕〔(Tropicos, ''Triantha'' (Nutt.) Baker )〕 ''Triantha'' has four known species. One of these is endemic to Japan. The other three are native to North America.〔(Kew World Checklist of Selected Plant Families )〕 〔(Flora of North America Vol. 26 Page 61 ''Triantha'' (Nuttall) Baker )〕〔(Biota of North America Program 2013 county distribution maps )〕 A comparison of DNA sequences has indicated that ''Triantha glutinosa'' might be two species.〔 Hiroshi Azuma and Hiroshi Tobe. 2011. "Molecular phylogenetic analyses of Tofieldiaceae (Alismatales): family circumscription and intergeneric relationships". ''Journal of Plant Research'' 124(3):349-357. 〕 Before the family Tofieldiaceae was established in 1995, ''Triantha'' and related genera were usually placed in Nartheciaceae, Liliaceae, or Melanthiaceae, but molecular phylogenetic studies of monocots and Alismatales have shown that inclusion of ''Triantha'' etc. in these families makes them polyphyletic. Some authors have included ''Triantha'' within the genus ''Tofieldia''.〔(Flora of North America: ''Tofieldia'' )〕 ''Triantha'' is distinguished from ''Tofieldia'' by its glandular-pubescent stems and by the presence of seed appendages. In 2011, a study of two nuclear genes and ten chloroplast genes showed that ''Triantha'' and ''Tofieldia'' are monophyletic and closely related sister clades. The species of ''Triantha'' are so closely related that the authors could not resolve any relationships among them.〔 ;Species〔 # ''Triantha glutinosa'' (Michx.) Baker - sticky asphodel - Canada, Alaska, Great Lakes region, Maine, scattered other spots in USA # ''Triantha japonica'' (Miq.) Baker - Honshu # ''Triantha occidentalis'' (S.Wats.) R.R.Gates-western false asphodel - Western Canada (Alb, BC), western USA (AK WA OR CA ID MT WY) # ''Triantha racemosa'' (Walter) Small-coastal false asphodel - Coastal Plain of USA from TX to NJ ==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「Triantha」の詳細全文を読む スポンサード リンク
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