岩生红豆 yan sheng hong dou

Trees evergreen, trunk vertical, to 15 m, to 44 cm d.b.h. Bark of stems grayish green, smooth when young, with rounded convex lenticels or longitudinal striations forming with age. Branchlets densely appressed yellowish brown tomentose; win­ter buds naked. Leaves imparipinnate, 14-17(-23) cm; petiole and rachis densely appressed gray pubescent; leaflets 17-23; petiolule short, ca. 2 mm; blades oblong-lanceolate or ovate-lanceolate, 2.7-5(-7) × 1.1-1.5 cm, thinly leathery, densely appressed yellowish brown pubescent abaxially, faintly appressed pubescent or glabrous adaxially, base rounded or broadly cuneate, apex acute, acuminate, or obtuse, sometimes retuse; midvein raised abaxially, impressed adaxially, lateral veins 5 or 6(or 7) pairs. Infructescence racemose or few branched, terminal and axillary. Legumes oblong or rhombic, compressed, 4-6 × 1.6-2.3 cm, glabrous; valves thickly woody, black at maturity. Seeds 1-3, red-brown, suborbicular, ca. 10 × 8 mm; hilum ca. 3 mm.

● Limestone neutral or slightly acidic soil of forests, often mixed with Carpinus, Quercus, etc.; 1100-1200 m. Guizhou (Qianling Shan).

Ormosia saxatilis is similar to O. microphylla, but its branchlets are densely appressed yellowish brown tomentose, its leaves are 17-23-foliolate, and its leaflets are densely appressed yellowish brown tomen­tose abaxially.