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''Trillium ovatum'', the Western Wake Robin, Pacific Trillium, or Western White Trillium, is a member of the Trilliaceae family, or sometimes included within the Liliaceae or Melanthiaceae.〔(Flora of North America, ''Trillium ovatum'' )〕 It occurs in parts of the western United States and western Canada, usually in rich forest. In the northern part of its range, which includes southern British Columbia, extreme southwestern Alberta, Washington, Oregon and east to Montana, Wyoming and northern Colorado, it often grows under Douglas-fir. Other trees which frequently shade this trillium include grand fir, western red cedar, and western hemlock; bigleaf maple, red alder and Sitka spruce join in near the coast. Near California shores, it is common under coast redwood. Associated understory plants include swordfern, vanilla leaf, violets, redwood sorrel and salal. ''Trillium ovatum'' is a perennial herb spreading by means of underground rhizomes. Each plant has 1 or 2 flowering stalks, each up to 50 cm tall. Flowers are white or pink, the color sometimes becoming darker as they get older. Occasionally, the petals are maroon rather than the typical white or pink.〔 ;varieties〔〔(Douglas, George Wayne & Pojar, Jim. 2001. Canadian Field-Naturalist 115: 343 )〕 * ''Trillium ovatum'' var. ''hibbersonii'' (T.M.C.Taylor & Szczaw.) G.W.Douglas & Pojar – Vancouver Island in British Columbia * ''Trillium ovatum'' var. ''oettingeri'' (Munz & Thorne) Case – northwestern California * ''Trillium ovatum'' var. ''ovatum'' – most of species range ==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「Trillium ovatum」の詳細全文を読む スポンサード リンク
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