12. Ormosia yunnanensis Prain, J. Asiat. Soc. Bengal, Pt. 2, Nat. Hist. 69: 183. 1900.
云南红豆 yun nan hong dou
Trees evergreen, to 25 m, ca. 80 cm d.b.h. Bark of stems gray. Branchlets and buds densely appressed rusty brown tomentose. Leaves imparipinnate, 14-31 cm; petiole, rachis, and petiolule densely appressed rusty brown tomentose; petiole 3.3-5.5 cm; rachis 6.5-12.5 cm, prolonged 0.6-1.5 cm or not prolonged below terminal leaflet; leaflets (7-)9-13(-15), opposite or upper rarely alternate; petiolule 2-3 mm, grooved; blades oblong or oblong-lanceolate, rarely obovate-oblong, 4.7-13.4 × (1.5-)2.2-3.8 cm, leathery, densely appressed rusty brown tomentose abaxially, becoming glabrescent, glabrous and glossy adaxially, base broadly cuneate to rounded, apex acute to acuminate or obtuse; lateral veins 7-9 pairs, raised abaxially, impressed adaxially. Panicles terminal and axillary, congested, 14-25 cm; peduncle and pedicel densely appressed rusty brown pilose; pedicel 2-3 mm; bracts 2-5 × ca. 1.5 mm, acute, deciduous, rusty pilose. Flowers 0.9-1.1 cm. Calyx campanulate, ca. 8 mm; teeth divided to middle part of calyx, triangular, densely appressed rusty brown tomentose inside and out. Corolla pink to orange-red. Ovary rusty brown pilose at margin. Legumes obovate, oblique, or oblong, 2.5-6 × 1.8-2.5 cm, beak acute, stipe ca. 5 mm, densely appressed rusty brown pilose at margin and base; valves thinly leathery, black when dry, glabrous, swollen around seeds, constricted between seeds; calyx persistent. Seeds 1-3, bright red, ovate or oblate, 8-13 × 6-12 × ca. 5 mm, glossy; hilum elliptic, sunken, 1-1.5 mm. Fl. Mar, fr. Oct.
● Plains, bottoms of ravines, mixed forests of mountain slopes; 500-1700 m. S Yunnan.
It is difficult to distinguish between this species and Ormosia olivacea from vegetative characters. The former has dense appressed rusty brown hairs; leaflets acute at the apex, glossy adaxially, with lateral veins arcuate; and legume valves thinly leathery, constricted between seeds. The latter has yellowish brown hairs; leaflets acuminate at the apex, dull adaxially, with lateral veins straight; and legume valves woody, not constricted between seeds.
"Ormosia lancifolia" (Cheng & Q. W. Yao, Sylva Sin. 2: 1324. 1985) belongs here but was not validly published because no Latin description or diagnosis was provided and no type was indicated (Vienna Code, Art. 36.1, 37.1).