Trillium 延齡草屬
型態特徵
Perennial herbs; with a corm or thickened, creeping, thickened rhizome; stem simple, erect to ascending, naked except for scarious sheath-like bracts at base. Leaves 3, terminal, verticillate, ovate, orbicular or rhombic-orbicular, entire to slightly undulate, chartaceous or nearly so. Flowers solitary, terminal, white, rose-purple or purplish brown; pedicel straight or archin, glabrous or pubescent; tepals 6 in 2 series; outer tepals green to yellowish green, persistent; inner tepals white or purple, petaloid, withering or absent; stamens 6, hypogynous; anthers linear, basifixed; ovary ovoid to globose or depressed ovoid, 3-celled; ovules several per cell; style straight, slender; stigmas 3, capitate or subentire. Fruit a berry, seeds several, ovoid to round, small, shining.
About 30 species, mainly in temperate regions of North America, eastern Asia and the Himalaya. Two species in Taiwan.
