单叶罗伞 dan ye luo san

Trees, to ca. 10 m tall, andromonoecious. Branches with conic prickles and densely ferruginous tomentose at first, later glabrescent. Leaves simple, unlobed; petiole 2.5-8 cm; stipules united at base of petiole, apically free, slightly prominent; blade oblong-elliptic to elliptic or narrowly ovate, 9-30 × 4.5-10 cm, papery, abaxially sparsely pubescent on veins, adaxially at first densely ferruginous tomentose, later glabrous, veins slightly raised on both surfaces, base broadly cuneate to nearly rounded, margin sharply serrate, apex acute to acuminate. Inflorescence terminal, erect, prickly, at first densely ferruginous tomentose, then subglabrous; primary axis 15-30 cm; secondary axes to 13 cm, with a terminal umbel of bisexual flowers and 1 or 2(or 3) lateral umbels of male flowers; peduncles 2-7 cm; umbels ca. 4 cm in diam.; pedicels 1.2-2 cm. Ovary 2-carpellate. Fruit (immature) subglobose, ca. 4 mm in diam.

Evergreen broad-leaved forests or coniferous broad-leaved mixed forests; 800-3000 m. S Xizang [India].