缘毛红豆 yuan mao hong dou

Ormosia semicastrata Hance f. howii (Merrill & Chun) Yakovlev.

Trees evergreen, to 10 m, to 12 cm d.b.h. Bark of stem grayish brown. Branchlets terete to angled, densely appressed grayish brown pubescent, becoming glabrate. Leaves impari­pinnate, 14.5-36 cm; petiole 4.2-5 cm; rachis 6.5-7 cm, pro­longed 5-8 mm below terminal leaflet; petiole, rachis, and petiolule grayish pubescent; leaflets 5-7; petiolule 7-10 mm, slightly grooved adaxially; blades oblong-obovate or oblong, 6-17 × 2-6.5 cm, thickly leathery, both surfaces glabrous or pu­bescent only on midvein abaxially, base cuneate or rounded, apex mucronate, obtuse, or retuse; lateral veins ca. 12 pairs, rarely 17, angled 60° with midvein, veinlets raised abaxially, impressed adaxially. Panicles terminal, up to 15 cm at fruiting, densely appressed brownish pubescent. Legumes obliquely elliptic-ovate or ovate-rhombic, slightly compressed, 2-2.5 × 1.5-2 cm, apex abruptly contracted to oblique beak, 3-4 mm, stipe 3-4 mm; valves light brown, thickly leathery, young valves and margin brownish pubescent, glabrescent or sparsely appressed brownish villous along margin at maturity; calyx per­sistent, densely appressed rusty brown pubescent. Seeds 1 or 2, dark red, suborbicular, slightly compressed or triangular, one surface flattened, 8-9 × 8-9 mm, glossy; hilum retuse, elliptic, ca. 2 mm.

● Open forests of mountain slopes, mostly on granite mountains; below 100-900 m. Hainan.