Shrubs scandent, to 3 m tall. Branchlets brown to blackish brown, villous, glabrescent, with curved minute prickles. Leaves simple; petiole 1.5–3 cm, gray or yellowish gray villous, with sparse, slightly curved prickles; stipules obovate, 7–10 × 5–7 mm, membranous, gray or yellowish gray villous, palmatipartite nearly to base; lobes linear to linear-lanceolate; blade narrowly ovate, 6–11 × 3–3.5 cm, abaxially densely gray or yellowish gray tomentose, with intermixed long hairs along veins, adaxially sparsely villous, base deeply cordate, margin lobed, often with 2–4 prominent lobes near base, with uneven coarse sharp serrations to doubly serrate, apex shortly acuminate. Inflorescences terminal and axillary, lax racemes; rachis and pedicels densely gray or yellowish gray villous, with sparse, glandular hairs, unarmed or with few needle-like prickles on pedicel; bracts obovate, 6–9 × 4–6 mm, villous, palmatipartite; lobes linear, margin with sparse, glandular hairs. Pedicel 1–2(–3) cm. Flowers 1–1.5(–2) cm in diam. Calyx densely gray to yellowish gray villous, with sparse, glandular hairs; sepals reflexed in fruit, triangular to ovate-triangular, 8–11 × 4–6 mm, margin entire, apex shortly acuminate. Petals white, broadly ovate to broadly elliptic, 7–10 × 5–8 mm, base shortly clawed, apex obtuse. Stamens many, shorter than petals; filaments broad, complanate, glabrous. Pistils numerous, much longer than stamens, glabrous. Fruit unknown. Fl. Mar–Apr.
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