Stems running on/in soil or water, rooting at nodes, younger ones climbing by tendrils, branched, terete, to 13 m, larger ones to 2 cm diam., soft-woody. Leaves: ocrea obscure, (0.1-)0.5-1 mm, usually fringed with reddish brown hairs; petiole dilated at base, 7-25 mm, glabrous or pubescent; blade 3-15 × 1.5-8 cm, base truncate to subcordate to broadly cuneate, apex acute to acuminate, glabrous or slightly pubescent abaxially, glabrous adaxially. Inflorescences 5-26 cm; peduncle (0.1-)5-35 mm. Pedicels jointed proximal to middle, 0.5-1 cm. Flowers: tepals linear-oblong to oblong, margins entire, apex acute; stamens prominently exserted. Achenes 8-10 × 3-5 mm, subglossy. 2n = 48.
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