16. Ormosia napoensis Z. Wei & R. H. Chang, Acta Phytotax. Sin. 22: 21. 1984.
那坡红豆 na po hong dou
Trees small, to ca. 10 m, to 25 cm d.b.h. Branchlets appressed rusty brown pubescent. Leaves imparipinnate, 8.3-19 cm; petiole 1.5-4.8 cm; petiole and petiolule glabrous or glabrescent; rachis 1-3.5 cm, prolonged 0.5-1.5 cm below terminal leaflet; leaflets 3-5; petiolule ca. 2 mm; blades oblong, terminal leaflet larger, 6-13.2 × 1.5-4 cm, glabrous or glabrescent on both surfaces, base rounded or cuneate, apex acuminate to caudate. Panicles terminal. Infructescence 11-12 cm. Legumes compressed, suborbicular or elliptic, 2.8-4.5 × 2.4-2.8 cm, stipe 3-5 mm, sparsely grayish pubescent, sometimes glabrous, pubescent only at apex and base; valves woody, dehiscent at maturity, reflexed outward, 2-3 mm thick, externally yellowish, internally rough, yellowish brown. Seed 1, dark red-brown, large, elliptic, 1.4-1.8 × 1-1.2 cm, slightly mucilaginous, slightly hard but fragile, easily separated from cotyledons; hilum on shorter axis but slightly off-center, white, convex, aril a yellow ring.
● Forests of mountain slopes; 400-500 m. Guangxi (Napo).
This species is close to Ormosia fordiana but has fewer leaflets, smaller legumes, with valves that are not internally glossy or stained reddish, and a smaller seed. Also it differs by its hilum not at the center of axis but slightly oblique, with white funicle and yellow aril ring.