特徵描述
作者
KAO, Muh-Tsung & DEVOL, Charles E.
型態特徵
Herbs or rarely shrubs. Leaves radical or cauline and opposite, entire, pinnatifid or pinnate; stipules absent. Flowers bracteate, sessile, cymose, bisexual, sometimes polygamous or unisexual, usually small; bracts sometimes fused to form an an outer epicalyx; calyx tube adnate to ovary, plumose or sometimes coronate; corolla superior, gamopetalous, tubular, infundibuliform or rotate, with a spur at base, segments 3–5, often equal, imbricate in bud; stamens 1–4, rarely 5, adnate to corolla tube, alternate with the lobes; ovary inferior, 1–3-celled, ovules 1 per cell, one locule fertile; style solitary, filiform, slender, stigma 2 or 3-lobed or capitate; ovules solitary, pendulous. Fruit a cypselate achene, 1-seeded; seed pendulous; embryo straight.
屬
Ten genera with about 400 species, mainly distributed in the northern hemisphere and South America, a few species in Africa. Three genera and eight species in Taiwan.
參考文獻
Triplostegia 雙參屬
作者
KAO, Muh-Tsung & DEVOL, Charles E.
型態特徵
Perennial, erect, slender herbs; stem covered with glandular hairs on upper parts. Leaves opposite, petiolate, toothed or pinnatifid, uppermost distant, small, sessile. Inflorescence terminal or axillary cymose; flowers small, sessile or short pedicelled; bracts small, narrowly oblong, epicalyx covered with glandular hairs; calyx limb minute, obscurely toothed; corolla tube pink or purple, funnel-shaped, 5-lobed, segments equal, spreading; stamens 4 inserted at base of corolla tube; style linear, stigma capitate. Achenes short beaked, free within the utricular involucel, 8-ribbed, with white hairs, crowned by the unaltered calyx limb.
