Branches pale lenticellate; branchlets minutely puberulent, rarely glabrous. Leaves papery to subcoriaceous; petiole 0.6-2 cm long; blade elliptic to ovate, 2.8-18 by 1.1-5.7 cm, 1.7-3.7 times as long as wide, apex acuminate, base cuneate to rounded, 3-7 pairs of secondary veins, strongly ascending, tertiary venation weakly scalariform and reticulate, glabrous or with a puberulent petiole, usually with hairs in the axils of the secondary veins with the midrib, occasionally completely glabrous, sometimes punctate beneath. Inflorescence of axillary and terminal cymes, usually forming a panicle; puberulent, rarely glabrous, 5.8-19.5 cm long; pedicels 0.6-6.2 mm long. Sepals ovate, sometimes reflexed, 0.5-1 by 0.4-0.8 mm, 0.9-2 times as long as wide, apex abruptly acuminate, obtuse or apiculate, puberulent or glabrous, ciliate, with colleters only at edges of sepals at base inside. Corolla white or greenish white; lobes dextrorse; bud ovoid, open corolla campanulate; tube 0.7-1.5 mm long, (0.8-)1-2.5 times as long as lobes; lobes falcate to the right, 0.6-1.2 mm long; glabrous outside, rarely sparsely pubescent on upper parts, pubescent inside. Stamens inserted a 0.2-0.5 mm from corolla base which is 0.1-0.4 of tube length; filament 0.1-0.5 mm long; anthers 0.9-1.3 by 0.3-0.4 mm, 2.3-3.3 times as long as wide. Disk 5-crenate; 0.2-0.4 mm long. Ovaries 0.3-0.7 mm long; style and style head 0.6-0.9 mm long. Fruit not stipitate, linear, mostly divergent, lenticellate, glabrous, 6.7-25 by 0.3-1 cm. Seeds: grain 7.3-18 by 2.2-3.9 mm; coma 2.8-6 cm long.
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Lianas to 50 m. Stems 10-30 cm in diam.; branches often lenticellate. Petiole puberulent, 1.5-3 cm; leaf blade elliptic or narrowly ovate, 5-15 X 1.5-6 cm, base obtuse, apex narrowly acuminate, glabrous; lateral veins 3-7 pairs. Cymes paniculate, compact, to 9 cm; peduncle pubescent. Sepals ovate, ca. 0.8-1 mm, apex subacute. Corolla pink, lobes oblong, as long as to longer than tube, to 2 mm, 1-toothed near base. Filaments ca. 0.5 mm; disc ringlike. Ovary pilose. Pistil head conical. Follicles narrowly ovoid, 9-23 X (0.4-)1-1.2 cm, base dilated. Seeds oblong, 2-4 cm, coma ca. 4 cm. Fl. Mar-Jun, fr. Jun-Dec.
Valleys, stream edges and shrub thickets. Mixed forests, brushwoods at elevations from 300-1000 metres.
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Mixed forests, brushwoods; at elevations of 300-1,000 metres in China.
It is a tropical plant. In Yunnan.