Woody vine. Branches shallowly 6-8-sulcate, puberulous. Leaves once or twice pinnate; leaflets papery or subcoriaceous, oblong, narrowly oblong, elliptic, or narrowly ovate, 1-4(-8.5) x 0.5-1.5(-3.5) cm, apex acute or obtuse, base cuneate or rounded, margin few-dentate or denticulate, undivided or 2-3-lobed or 2-3-parted, adaxially sparsely appressed-puberulous or subglabrous, abaxially on veins puberulous, basal veins abaxially slightly prominent; petioles 2-5 cm long. Cymes axillary and terminal, 3-11-flowered, often panicle-like; peduncles (1-)9-12 cm long, sparsely puberulous; bracts shortly petiolate, simple, ovate, or ternate, 0.7-2 cm long. Flower 2-2.8 cm in diam.; pedicel 2-5(-7.5) cm long, sparsely puberulous or glabrous. Sepals 4, white, oblong or oblong-elliptic, 10-15 x 4-8 mm, apex obtuse or slightly acute, on both surfaces sparsely or densely puberulous, outside on margin velutinous. Stamens 6-13 mm long; filaments narrowly linear, pubescent; anthers narrowly oblong or linear, 1. 5-3.2 mm long, glabrous, apex obtuse or minutely apiculate. Ovaries puberulous; styles 6-9 mm long, densely villous. Achenes compressed, ovate or elliptic, 3-4 x 2-3 mm, pubescent; persistent styles 2.4-3.5 cm long, plumose.
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