河口红豆 he kou hong dou

Trees, to 20 m. Branchlets dark brown pubescent, be­coming glabrescent; buds densely appressed black pubescent. Leaves imparipinnate, 26-41 cm; petiole 3-5 cm; rachis 10-20 cm, prolonged 0.8-1.8 cm below terminal leaflet, glabrous or glabrescent; leaflets 9-11; petiolule 3-5 mm, grooved, glabrous or sparsely pubescent; blades lanceolate, obovate-lanceolate, or oblong, 6.5-18 × 2.7-6.4 cm, young leaves dark brownish pu­bescent, becoming glabrescent, hairs short abaxially, base nar­rowly cuneate, apex acute; midvein impressed adaxially, lateral veins 9 or 10 pairs, raised abaxially. Panicles terminal; rachis densely appressed grayish brown pubescent. Legumes large, very fleshy, woody, spheroidal or oblong, 4.5-9 × ca. 4 cm, beak 6-8 mm, stipe absent or short; valves grayish brown, 6-10 mm, apex and base densely appressed yellowish brown pubes­cent, internally white, tinged reddish near seed, septum between seeds membranous. Seeds 1-3, reddish brown, elliptic, 2.5-3 × 1.7-2 cm, fragile; hilum 2-3 mm, slightly off-center.

● Humid open forests and riversides; ca. 300 m. Yunnan (Hekou, Mengla).

Ormosia hekouensis is similar to O. crassivalvis Gagnepain (of Vietnam) but differs by its larger, differently shaped leaflets and its terminal panicles. The latter has linear-lanceolate leaflets, ca. 15 × 2 cm, and axillary inflorescences.