圆叶羊蹄甲 yuan ye yang ti jia

Phanera macrostachya Bentham.

Lianas, with tendrils. Young branches glabrescent. Stipules caducous; petiole 3.5-4.5 cm, glabrescent; leaf blade subor­bicular, 10-15 cm in diam., both surfaces glabrous, veins 9-11, base cordate, apex bifid to 1/5, lobes with acuminate or obtuse apices. Inflorescence a raceme or panicle; bracts lanceolate, ca. 3.5 mm, acuminate. Pedicel ca. 1.5 cm. Flower buds obovoid, ca. 1 cm, densely pubescent with rusty hairs. Receptacle bell-shaped; calyx lobes 5, ca. 4 mm, obtuse. Petals subequal, 6-12 mm with a claw 2-4 mm. Fertile stamens 3; filaments ca. 2 cm, glabrous. Staminodes 7. Ovary shortly stalked, ca. 1 cm, densely pubescent; style ca. 1 cm, glabrous; stigma small. Legume unknown.

Forest margins. Known in China from a single collection from Yunnan (Mengla) [NE India, Myanmar, Thailand, N Vietnam].