Shrubs climbing, 1–2 m tall. Branchlets brownish to purplish brown, angled, glabrous, with sparse, curved prickles. Leaves imparipinnate, 7–11-foliolate, rarely 5-foliolate; petiole 3.5–6 cm, purplish brown, petiolule of terminal leaflet 0.6–2(–3) cm, lateral leaflets subsessile, petiolules and rachis glabrous or slightly pubescent, with sparse, curved minute prickles; stipules linear-lanceolate, 3–5 mm, glabrous or margin slightly puberulous, margin entire; blade of leaflets ovate to ovate-lanceolate, (2–)3–7 × 1–3 cm, abaxially pubescent along veins, adaxially pilose, base rounded or subtruncate, margin coarsely sharp doubly serrate, apex acuminate. Inflorescences terminal, corymbs, 2–4 cm, several flowered, or flowers several in clusters; rachis and pedicels glabrous, unarmed; bracts linear-lanceolate, 3–5 mm, glabrous or slightly puberulous. Pedicel (0.7–)1–1.5 cm. Flowers 1–1.2 cm in diam. Calyx abaxially glabrous; tube pelviform; sepals erect at anthesis, reflexed in fruit, narrowly ovate or triangular-ovate, 4–7 × 2–4 mm, inner sepals tomentose at margin, apex acute to acuminate. Petals pink to purplish red, obovate, 5–7 × 4–6 mm, base puberulent and shortly clawed. Stamens numerous, slightly shorter than or nearly as long as petals; filaments linear or broadened basally. Pistils slightly shorter than or ca. as long as stamens; ovary and base of style soft hairy. Aggregate fruit purplish black at maturity, globose, 8–9 mm in diam., thinly pubescent; pyrenes rugulose. Fl. May–Jun, fr. Jul–Aug. 2n = 14*.
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