Dalbergia assamica; Dalbergia balansae Prain; D. lanceolaria Linnaeus f. var. assamica (Bentham) Thothathri; D. szemaoensis Prain.
Trees, 7-10 m tall. Branches horizontally spreading. Leaves 25-30 cm; stipules caducous, large, leaflike, ovate to ovate-lanceolate, ca. 10-6 mm; leaflets 13-21; petiolules ca. 5 mm, puberulent, soon glabrous; blade oblong or oblong-elliptic, 3-5- 1.5-2.5 cm, papery, both surfaces sparsely apapressed puberulent, but soon glabrous adaxially, with close, finely, slightly prominent reticulate veinlets on both surfaces, base rounded or cuneate, apex obtuse, rounded or emarginate. Panicles axillary, lax, 10-15 -7.5-10 cm; peduncles, branches, and pedicels densely rusty puberulent; bracts and bracteoles deciduous, ovate, puberulent. Flowers 6-8 mm. Calyx campanulate, 5-toothed; lowest tooth longer than tube and ca. 2 — as long as triangular, acute others, upper 2 teeth subconnate. Corolla white, with purple stripes inside; petals long clawed; stanÂdard reflexed, orbicular, emarginate, base slightly thickened; wings broadly ovate; keel half-moon-shaped, with downward auricles on upper side below as wings. Stamens 10, diadelphous (5+5); filaments free in upper 1/3, alternately shorter and longer. Ovary stipitate, pubescent, 1-4-ovuled; style subulate, slender; stigma minute. Legume broadly ligulate or oblong to strap-shaped, 5-9 — 1.2-1.8(-2.5) cm, leathery, base attenuate, cuneate, apex acute, inconspicuously reticulate opposite 1 or 2(-4) seeds. Seeds reniform, compressed, ca. 6 — 2.5 mm. Fl. Apr-Jul, fr. Sep-Dec.