Shrubs scrambling, lianoid. Branchlets purplish brown, terete, with dense purplish red long bristles and stalked glands, with sparse, hooked minute prickles. Leaves simple; petiole 1–2 cm, with dense purplish red long bristles and with sparse, small prickles; stipules caducous, free, brown, oblong, 1–1.8 cm, apex entire or with few teeth; blade ovate-lanceolate or elliptic-lanceolate, 12–17 × 5–9 cm, lateral veins 7–9 pairs, both surfaces glabrous, abaxially with minute hooked prickles along veins, base cordate, margin irregularly coarsely sharply serrate, apex caudate. Inflorescences terminal, lax cymose panicles, large; rachis and pedicels with dense purplish red long bristles and stalked glands; bracts oblong or ovate-lanceolate, 1–1.6 cm, margin entire or serrate. Pedicel 2–4 cm. Flowers 1.2–2 cm in diam. Calyx abaxially densely yellowish tomentose, purplish red bristly, with stalked glands; sepals reflexed after anthesis, ovate-lanceolate, to 1 cm, apex caudate, outer sepals apically 2-or 3-laciniate, inner sepals entire. Petals white, suborbicular or broadly elliptic, thinly pubescent, base barely clawed. Stamens many; filaments linear or somewhat broader basally; anthers sericeous-villous. Pistils nearly as long as or slightly longer than stamens; ovary soft hairy apically, glabrescent. Aggregate fruit reddish black, subglobose, glabrous; pyrenes coarsely rugose. Fl. May–July, fr. July–Aug.
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