Stems long, slender, twining, finely puberulous or nearly glabrous and sparingly armed with stinging hairs. Leaves distinctly petioled, membranous, ovate or ovate-oblong, acute or acuminate, base distinctly cordate, margin shortly to distinctly serrate, 2–4 in. long, 1–2 1/2 in. wide, sparingly to distinctly bristly setose, especially on the nerves and especially beneath, otherwise glabrous; petiole 3/4–2 1/2 in. long, sparingly to closely bristly setose with stinging hairs; stipules lanceolate, 1–1 1/2 lin. long, spreading or somewhat reflexed with setose margins, otherwise glabrous. Racemes lateral and terminal on the lateral branches, slender, rather dense, 1/2– 3/4 in. long, with a puberulous naked peduncle 1/4– 1/3 in. long, with many male flowers above and 1–3 basal female flowers; pedicels in both sexes solitary to and shorter than the bracts; male bracts membranous, narrow-lanceolate, sparingly hirsute, 1 lin. long, reflexed; female bracts like the male but slightly larger. Male sepals 3, wide-ovate, sparingly hirsute externally. Stamens 3; filaments as long as the anthers. Female calyx-segments 3, 1-seriate, ovate, membranous, accrescent but hardly indurated, 5 lin. long, rhachis broadly ovate-oblong, pectinately 6–7-lobulate on each side, softly hirsute externally, lateral lobules ascending, persistent, not exceeding the diameter of the rhachis in length, softly hirsute and sparingly beset with stinging bristles. Ovary sparingly strigose and bristly; styles 3, glabrous, shortly connate at the base only. Capsule 3-coccous, sparingly bristly, 1/3 in. across; cocci subglobose. Seeds globose, grey mottled with brown.
