Shrubs scandent, ca. 1 m tall. Branchlets brownish, dark brown, or reddish brown, terete, slightly angled, glabrous, with sparse prickles and stalked glands 1–2 mm. Leaves imparipinnate, (5–)7–9(–11)-foliolate, sometimes with 5 leaflets on flower bearing branchlets; petiole 4–7 cm, petiolule of terminal leaflet to 1 cm, lateral leaflets shortly petiolulate or subsessile, petiolule and rachis glabrous, with sparse, stalked glands and minute prickles; stipules lanceolate, 1–1.4 cm, glabrous or puberulous, sometimes with sparse, shortly stalked glands; blade of leaflets lanceolate or ovate-lanceolate, 4–7 × 0.8–2 cm, both surfaces slightly pubescent when young, gradually glabrescent, abaxially with sparse, small prickles along midvein, base rounded, margin irregularly tenuously sharply serrate to doubly serrate, apex acuminate. Inflorescences terminal, corymbose, 4–6 cm, 3–5-flowered, rarely flowers solitary; rachis and pedicels glabrous, with unequal long stalked glands; bracts lanceolate, 6–10 mm, glabrous. Pedicel 2–4 cm. Flowers 3–4 cm in diam. Calyx abaxially glabrous; tube pelviform, ca. 1 cm in diam., with sparse, glandular hairs; sepals erect at anthesis, reflexed in fruit, oblong-lanceolate or narrowly ovate-lanceolate, 0.9–1.5 cm × 4–6 mm, inner sepals with gray tomentose margin, apex long caudate. Petals white, narrowly obovate or oblong, 0.9–1.4 cm × 6–8 mm, base clawed. Stamens unequally long, shorter than petals; filaments somewhat broadened and flattened. Pistils many, more than 100, shorter than stamens; style and ovary glabrous. Aggregate fruit red, subglobose, to 1.5 cm in diam., glabrous or with glandular hairs. Fl. Apr–May, fr. Jun–Jul. 2n = 14*.
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