Climber 1.5-3(-4) m high. Twigs slender, straight or slightly zig-zag, with leaves not seldom in two rows, densely clothed with up to 0.5 mm long, straw-coloured hairs, rarely almost glabrous or soon glabrescent; internodes 1—2(-3) cm. Thorns almost straight, up to 2, rarely 5 mm, thin, dark, with lighter base, pointing upwards, exceptionally downwards. Leaves herbaceous, broadest below, rarely at the middle, (1.5-)1.8-2.5(-4.3) times as long as wide, glabrous or sparsely hairy above, hairy beneath, especially on the nerves, 4-8(-15) by 2-3.5(-5) cm; base cuneate, sometimes rounded, rarely acute, top narrowed, acute to (rarely long-) acuminate, often with a nerf-tip; midrib above shallowly sulcate in the lower part, yellowish, sparsely hairy underneath; nerves 6-8 pairs; petiole 2-4(-12) mm, hairy as are the twigs. Subumbels axillary; peduncle 0.5-6 cm, thin, bearing sometimes one or more small leaves, hairy. Pedicels slender, 1.5-3 cm, mostly with distant hairs, rarely glabrous. Bracts inconspicuous, narrow. Buds globular to depressed-globular, 5-6 mm diam. Flowers white or pale pink. Sepals persistent for a short time, outer pair 5-6 mm diam., herbaceous, hairy (or rarely glabrous), inner sepals 6-7 mm diam., thinner, ciliate. Petals very thin, ovate, 2-4 by 2.5-3 mm, ciliate. Stamens 15 to 60, 8-12 mm long, anthers 1-1.5 by 0.5-1 mm. Torus obscure. Gynophore 1.5-3(-4¾) cm, glabrous; ovary ovoid, c. 2 by 1 mm. In fruit the pedicel, torus, and gynophore only slightly incrassate. Fruit globular, c. 1.5 cm diam., pericarp leathery, thin, smooth, glossy, blackish. Seeds few, subellipsoid, c. 0.5 cm long.
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