Shrubs evergreen or semi-evergreen, climbing. Branchlets robust, glabrous when old; prickles sparse, curved, flat, gradually tapering to base; bristles sometimes dense. Leaves including petiole 6–11 cm; stipules mostly adnate to petiole, free parts lanceolate, glabrous, margin glandular, apex acuminate; rachis and petiole shortly prickly, sparsely glandular-pubescent; leaflets usually 3, rarely 5, pale green abaxially, deep green adaxially, often purple-brown when old, oblong-ovate or long elliptic, 4–8 × 2–4 cm, glabrous, base subrounded or broadly cuneate, margin acutely depressed serrate, apex caudate-acuminate or acute. Flower solitary, 3–3.5 cm in diam.; pedicel 6–12 mm, glabrous or sparsely pubescent when young, rarely glandular-pubescent; bracts absent. Hypanthium pyriform or obovoid. Sepals 5, oblong-lanceolate, abaxially glabrous, adaxially densely pubescent, margin entire or slightly incised, apex caudate-acuminate, after anthesis reflexed, deciduous. Petals 5, purple-red, broadly obovate, base cuneate, apex emarginate. Styles free, exserted, purple-red, equaling stamens, pubescent. Hip often black-purple, pyriform or obovoid, smooth. Fl. Apr–Jun, fr. May–Aug.
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