Erect, dichotomously branched small shrub. Twigs slightly angular, thinly strigose, glabrescent, at the nodes often with small, triangular pseudostipules. Leaves oblong to linear-lanceolate, 4.5-15 by 1.5-3.5 cm, cuspidate, base attenuate, thinly strigose, up to 2 cm petioled. Racemes terminal between 2 opposite twigs or leaves, erect, later pendulous, including the peduncle 3.5-7.5 cm, lax. Bracts and bracteoles early caducous. Flowers c. 15 mm long, white to pink and later violet, with yolk-yellow appendages on the keel, on 4-11 mm long pedicels. Sepals rounded, ciliate, the alae obovate-oblong. Upper petals lanceolate; keel with 2 large fleshy entire appendages. Filaments free for c. ¼. Disk annular, abaxially protruding. Ovary ± quadrangular with rounded edges; style straight in basal half, in upper half falcate, apically weakly 2-fid, at inner side with the stigmatic lobe. Capsule broadly obcordate, c. 9-10 by 11-14 mm, winged (wings not transversely veined), without protruding nerves, coriaceous, very densely covered by white, orbicular, flat papillae. Seed elliptic, at micropylar side with a small appendage, reddish brown, glabrous, up to about halfway covered by the smooth aril, the slightly protruding chalaza and the raphe distinctly visible.
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