Shrubs scandent, 1–2 m tall. Branches brownish purple, cylindric, with many curved prickles and glaucous bloom; branchlets purplish red, prominently angled, glabrous, with sparse, small curved prickles. Leaves imparipinnate, 5-foliolate; petiole brownish purple, 5–6 cm, petiolule of terminal leaflet 2.5–3 cm, lateral leaflets subsessile, petiolule and rachis glabrous, with sparse, curved minute prickles; stipules lanceolate or oblong-lanceolate, 8–11 × 2–4 mm, glabrous, apex acuminate; blade of leaflets 4–6 × 2.5–5.5 cm, membranous, abaxially paler, glabrous or somewhat puberulous along veins, or with sparse, curved small prickles along midvein, adaxially green, glabrous, slightly rugulose, margin coarsely doubly serrate; terminal leaflet broadly ovate or suborbicular, base subcordate, rarely rounded, sometimes 3-lobed above middle, apex acute, rarely somewhat obtuse, lateral leaflets ovate, base obliquely rounded to subtruncate, margin not divided, apex acute to shortly acuminate. Inflorescences terminal, shortly corymbose, 4-or 5-flowered, or flowers in clusters of 2 or 3 in leaf axils; rachis and pedicels glabrous, with few small curved prickles; bracts lanceolate or oblong-lanceolate, 6–9 × 2–3 mm, glabrous, apex acuminate. Pedicel 6–12 mm. Flowers 1.2–1.4 cm in diam. Calyx dark brownish purple, glabrous; tube pelviform; sepals erect at anthesis, reflexed in fruit, broadly ovate, 6–8 × 5–7 mm, caudate, inner sepals marginally tomentose. Petals purplish red, suborbicular, 8–9 mm in diam., base broadly shortly clawed, margin erose. Stamens many, slightly shorter than petals. Pistils longer than stamens; style and ovary densely villous. Fruit unknown. Fl. May–Jun.
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