大麻叶巴豆 da ma ye ba dou

Treelets to 7(-10) m tall; young branches with sparse, very quickly deciduous stellate hairs. Petiole 4-10(-14) cm, apex with 2 discoid glands; leaf blade ovate-elliptic, (10-)14-20(-30) × 7-10(-14) cm, thinly leathery, both surfaces glabrous, base broadly cuneate or rotund, apex acute to acuminate or caudate-acuminate; basal veins 3, lateral veins 4 or 5. Inflorescence terminal, erect or slightly sloping, to 15 cm, sparsely stellate-pubescent, glabrescent; bracts narrowly ovate to linear, 1-3 mm, caducous; flowers usually 3-5(-9) per bract, proximal clusters bisexual with central female flower, distal clusters all male. Male flowers: pedicels slender, 2-4 mm, glabrous; sepals 5, 1.5-2 mm, woolly at apex; petals 5, as large as sepals, glabrous outside, woolly inside; stamens numerous. Female flowers: pedicels ca. 2 mm, stellate-tomentose; sepals and petals as in male; ovary densely yellow tomentose; styles 3, bifid, lobes linear, black when dry, glabrous. Capsules ellipsoidal, ca. 2 × 1.8 cm, with sparsely appressed stellate hairs. Seeds ellipsoidal, 1.4-1.6 × ca. 1 cm, smooth. Fl. Jun-Aug, fr. Aug-Oct.

● Montane sparse forests; 1000-1800 m. S Yunnan.