Shrubs climbing, ca. 2 m tall. Branchlets dark brown; young shoots rust colored tomentose, glabrate in age, with sparse, curved prickles. Leaves simple; petiole 1.5–2 cm, rusty tomentose, glabrescent; stipules early caducous, lanceolate to oblong-lanceolate, tomentose-villous; blade ovate to ovate-lanceolate, 5–8 × 3–4 cm, abaxially densely rusty tomentose, adaxially pilose, base cordate, margin lobed or undulate, irregularly obtusely coarsely serrate to doubly serrate, apex acuminate. Inflorescences terminal or axillary, racemes, few flowered; rachis and pedicels rusty tomentose-villous, with short glandular hairs, with sparse, needle-like prickles; bracts caducous, lanceolate to oblong-lanceolate, smaller than stipules, tomentose-villous. Pedicel 2–3 cm. Flowers more than 1 cm in diam. Calyx abaxially densely rusty tomentose-villous; sepals erect, rarely reflexed in fruit, narrowly ovate to triangular-ovate, margin entire, apex acute. Stamens many; filaments broad, flat, glabrous. Pistils numerous. Aggregate fruit black, subglobose, 1–1.6 cm in diam., glabrous, with many drupelets; pyrenes prominently rugose. Fl. Apr–May, fr. Jun–Jul.
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