三裂叶薯 shan lie ye shu

Batatas triloba (Linnaeus) Choisy; Convolvulus trilobus (Linnaeus) Desrousseaux; Ipomoea blancoi Choisy.

Herbs annual. Stems twining or prostrate, glabrous or nodes sparsely pubescent. Petiole 2.5-6 cm, glabrous, sometimes tuberculate; leaf blade broadly ovate to circular in outline, 2.5-7 X 2-6 cm, glabrous or sparsely pilose, base cordate, margin entire or coarsely dentate to deeply 3-lobed. Inflorescences dense umbellate cymes, 1- to several flowered; peduncle 2.5-5.5 cm, glabrous, angular, verruculose distally; bracts lanceolate-oblong, minute. Pedicel 5-7 mm, ± angular, glabrous, verruculose. Sepals slightly unequal, 5-8 mm, glabrous or sparsely pilose abaxially, margin fimbriate, apex obtuse or acute, mucronulate; outer 2 oblong, slightly shorter; inner 3 elliptic-oblong. Corolla pink or pale purple, funnelform, 1.5-2 cm, glabrous; limb obtusely 5-lobed. Stamens included. Pistil included; ovary pubescent. Stigma 2-lobed. Capsule ± globular, 5-6 mm, bristly pubescent, apiculate, 2-loculed, 4-valved. Seeds dark brown, ca. 3.5 mm, glabrous. 2n = 30.

Roadsides or fields; 0-800 m. Anhui, Guangdong, S Shaanxi, Taiwan, Zhejiang [Indonesia, Japan (Ryukyu Islands), Malaysia, New Guinea, Philippines, Sri Lanka, Thailand, Vietnam; North America (native to the West Indies), Pacific Islands, now a circumtropical weed].