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''Trillium petiolatum'' (round leaf trillium, Idaho trillium) is a species of ''Trillium'' native to the northwestern Western United States, the States of Idaho, Oregon, and Washington.〔〔(Biota of North America Program 2014 county distribution map )〕〔(Soukup, Victor G. 1982. Phytologia 50:290-291 )〕 It is somewhat unique among ''Trillium'' species as it has round petiolate leaves and flowers close to the ground as opposed to most other ''Trillium'' species which flower above the leaves. The plant is small, measuring just a few inches tall. It generally flowers from early April to late May and its flower is typically dark maroon to purple in color. It can be found near stream beds, under scrub brush, and near the edges of forests. Like most other trillium varieties in the Pacific Northwest, this variety prefers acidic soil.〔(Flora of North America Vol. 26 Page 113 ''Trillium petiolatum'' )〕 ;Morphology〔 *Scapes: 4-17 cm long, terete. *Leaves: petiolate. *Blades: 7-14 cm long x 5.5-10.2 cm wide, not mottled. *Flower: sessile. *Sepals: 22-47 mm long x 7-10 mm wide. *Petals: 30-55 mm long x 4-10 mm wide, red, maroon, purple, green or yellow, not spirally twisted. *Anthers: 16-20 mm long, with latrorse dehiscence. *Ovary: 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 petiolatum」の詳細全文を読む スポンサード リンク
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