Shrub or small to large tree, up to 30 m tall. Twigs densely hirsute, hairs rusty brown, later glabrescent. Leaves 1-2-jugate, occasionally some on the same plant unifoliolate. Petiole 2.5-5(-7) cm, densely hirsute; rachis, if present, 3-5(-7.5) cm. Leaflets elliptic, sometimes ± rhomboidal or nearly orbicular to oblong, 5-11(-18) by 2.5-7(-13) cm, the terminal leaflet generally larger than the laterals, apex obtuse to acute or sometimes slightly acuminate, base obtuse and decurrent or rarely rounded; petiolule 1-2 (-4) cm long in terminal leaflets and 1-3(-8) mm long in lateral ones; margin distinctly serrate; nerves in 7-12(-17) pairs. Upper surface of leaflets glabrous, with venation distinctly sunken; lower surface very densely to rather sparsely rusty hirsute, late-glabrescent (often in patches), with prominent venation. Domatia absent. Stipules broadly ovate or reniform, 8-12 by 10-15 mm, sessile or with a very short stalk, apex rounded, margin ± deeply dentate, surface densely hirsute. Inflorescence thryrsiform, up to c. 40 by 20 cm; usually one subunit per axil, at distal or subdistal nodes; branches densely hirsute throughout. Flowers shortly pedicellate, the pedicel up to 1.2 mm long, densely hairy. Sepals 1-1.6 by 0.8-1.5 mm, densely stellate-hirsute below. Petals narrowly obovate or oblanceolate, 1.1-1.5 by 0.4-0.5 mm. Stamens with filaments c. 1.8 mm long and an-thers 0.3 by 0.3 by 0.2 mm. Disc 0.4-0.8 mm high, 0.2-0.3 mm thick. Ovary 2-carpellate, 0.7-1.3 by 0.5-1.1 mm, densely stellate-hirsute, often with rounded glands; ovules 10-14 per locule; style 0.9-1.2 mm. Fruit with valves 3.5-6 mm long, 2-3 mm wide, with several seeds. Seeds including wings c. 1.8 mm long, surface papillose.
In lower montane forest from (1400-)1800 m upwards to 3300 mas an upper canopy tree or in the understorey; at higher altitudes frequently in forest regrowth, on landslides, on the forest-grassland edge, in low mossy forest, or even in subalpine grassland.
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