Monoec. or polygamous herb with stout arcuate or prostrate stolons. Stems short, c. 1-1·5 cm. diam., ± pilose. Lvs on subterete, fistular, ± pilose-pubescent petioles; sheath membr., amplexicaul, produced into ligule margined by hairs. Lamina suborbicular-reniform, up to 30 cm. or more wide, shallowly lobed, crenate-serrate with teeth mucronate or shortly awned; glab. or nearly so above, ± pilose below; veins prominent above and below, flabellate. Umbels compound, bracts foliaceous, bractlets linear. Calyx truncate; petals 5, about linear-oblong, reddish purple; stamens 5. Ovary 2-loculed, style-branches 2. Fr. black, shining, globose, c. 3·5 mm. diam.; disk with prominent stylopodia; seeds 1 per locule, ovoid.