Shrub to small tree, up to 10 m. Twigs rather densely hairy in axillary area, further glabrous to sparsely minutely hairy. Axillary buds 2-4, up to 0.5 mm long, hairy. Petiole (12—)15—21(—27) mm, glabrous to sparsely minutely hairy, not transversely wrinkled, often with glands. Leaf-blade 12.5-40 by 4.5—12(—13) cm, base cuneate to rounded or cordate; above often slightly bullate between the secondary nerves, greenish to yellowish brown, midrib deeply sunken; beneath yellowish green, mostly glabrous, secondary nerves 12-20 pairs, forming a distinct intramarginal nerve; glands mostly numerous, scattered, 0.1-0.2 mm diam. Inflorescences sometimes also on older nodes, shorter than the leaves; axes strongly flattened basally, ribbed, densely minutely hairy; in basal part flowers with 3 together; bracts and bracteoles relatively long-persistent. Pedicel 2-4 mm, minutely hairy. Sepals: outer sepals 2.3-3.3 by 2.1-3.3 mm, often with glands; inner sepals 2.8-4 by 2.5-4 mm. Petals light purple, when dry pale yellow, the longest one 8.5-11.5 mm; carina sparsely minutely appressedly hairy outside, glabrous inside; other petals slightly hairy basally, further glabrous. Stamens: filaments connate over (0.5—)1—3 mm, rarely some filaments free; anthers 0.5-0.9 mm long. Ovary (sub)sessile, ribbed, appressedly hairy; ovules 4. Fruit ovoid, c. 2 by 1.5 cm, apically shortly but distinctly beaked, strongly verrucately ribbed; pedicel 3-5 mm, minutely hairy.
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