柔毛红豆 rou mao hong dou

Trees evergreen, to 20 m, to 40 cm d.b.h. Branchlets brown pubescent. Leaves imparipinnate, 12-16 cm; petiole 1.5-4 cm; rachis 2-2.7 cm, prolonged 1.2-1.5 cm below terminal leaflet; petiole and rachis slightly pubescent or subglabrate; leaflets 5; petiolule ca. 6 mm, impressed adaxially, nearly gla­brous; blades elliptic or oblong, 4.5-9.5(-11) cm, light colored pubescent abaxially, green adaxially, base cuneate, apex acute, mucronate. Inflorescences terminal panicles or axillary ra­cemes, ca. 8 cm; peduncle and pedicel densely appressed short brown pubescent, pedicel ca. 5 mm. Calyx teeth triangular, abaxially densely appressed brownish pubescent. Standard fan-shaped, ca. 7.5 × 10 mm, claw ca. 1.5 mm; wings elliptic, ca. 9 × 3 mm, claw ca. 3 mm; keel oblong, ca. 8 × 3-5 mm, claw ca. 4 mm. Stamens 5-10 mm, unequal. Ovary densely appressed yellow-brown pubescent. Legumes rhombic or ellipsoid, turgid, 3.3-5.6 × ca. 2.7 × 1.2 cm; valves woody, ca. 4 mm thick, densely appressed yellowish brown pubescent, internally sep­tate. Seeds 1-4, red, ellipsoid, ca. 1.4 × 0.8 × 0.7 cm; hilum ca. 2 mm. Fr. Sep-Oct.

● Valleys of mountain slopes. S Guangxi (Dongxing, Shangsi).

Ormosia pubescens is similar to O. xylocarpa, but the former has 5 leaflets, which are elliptic or oblong, with an acute and mucronate apex, and legumes that are more turgid, with valves densely appressed yellowish brown pubescent and margins not reflexed. The latter has 5-7 leaflets, which are oblong or oblong-lanceolate, with an obtuse or shortly acute apex, and legumes that are compressed, with valves densely appressed short yellowish brown sericeous and margins re­flexed outward.