Shrubs climbing. Branchlets dark brown, pubescent, with sparse, short prickles. Leaves simple; petiole 4–8 cm, pubescent, with minute prickles; stipules free, leaflike, broadly ovate or broadly narrowly ovate, 1.5–2 × 1–1.5 cm, palmately 5-veined, abaxially pubescent, margin lobed or serrate; blade suborbicular or broadly ovate, abaxially densely yellowish brown tomentose and pubescent along veins, adaxially glabrous or pubescent only along veins, base cordate, margin irregularly shallowly serrate, teeth abruptly pointed, 5–7-lobed; lobes triangular, terminal one largest, apex acute. Inflorescences terminal, subracemes, few flowered, or flowers in clusters in leaf axils, rarely flowers solitary; rachis and pedicels densely villous; bracts brown, broadly ovate or narrowly ovate, 1–1.8 × 0.9–1.6 cm, soft hairy, margin lobed or serrate above middle. Pedicel 5–7 mm. Flowers 1–1.5 cm in diam. Calyx to 2 cm, abaxially densely villous; sepals ovate-lanceolate, apex acuminate, outer sepals usually laciniate apically; lobes lanceolate. Petals broadly ovate or suborbicular, glabrous, base shortly clawed, margin undulate or erose, apex abruptly pointed. Stamens many, much shorter than petals; filaments slightly broadened basally. Pistils 50–70 or more, much longer than stamens, glabrous. Fruit unknown. Fl. May–Jun.
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