Subshrubs, twining or climbing, 3-5 m tall, most parts densely yellowish villous and with stinging hairs. Stipules triangular, ca. 3 mm, pilose; petiole 1-4.5 cm, villous; leaf blade broadly ovate or triangular-ovate, often shortly 3-lobed, 3-6 × 2-4 cm, papery, villous, more densely so abaxially and on major veins, base cordate, margin irregularly serrate, apex abruptly acuminate; basal veins 3-5, lateral veins 3-5 pairs. Racemes 6-10 cm, villous; peduncle 1-5 cm; female flowers 1-3, male flowers many; bracts narrowly ovate or lanceolate, 2-3 mm. Male flowers: pedicel ca. 2 mm; calyx globose in bud, 2.5-3 mm in diam., pilose; calyx lobes 3, broadly ovate or triangular-ovate, ca. 2 mm; stamens ca. 1 mm. Female flowers subsessile; sepals 6, unequal, pubescent, larger 3 obovate, 3.5-5 × 2.5-3 mm, margin dentate, smaller 3 oblanceolate, 1-3 × 0.5-1.5 mm, slightly larger in fruit; ovary densely hispid; styles thick, wide-spreading, plumose-papillose. Capsule hispid, 4-5 × 8-9 mm. Seeds globose, ca. 4 mm in diam. Fl. Jun-Jul, fr. Jul-Aug.
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