Plants (30–)40–50(–100) cm. Leaves: stipules 3–4 mm, margins usually deeply toothed, rarely entire; petiole 5–18 cm; blade ± round in outline, 6–15 cm diam., deeply lobed, lobes 3/5–4/5 blade length, base broadly cordate, margins dentate, teeth and lobe apices acute, not aristate. Staminate flowers: calyx funnel-shaped, tube 12–17 mm, distally flaring, stinging hairs present, lobes 10–17 mm; stamens of outer whorl shorter than inner, filaments of outer whorl distinct or connate basally, of inner whorl connate most of length; staminodes 0. Pistillate flowers: sepals 15–25 mm; stigmas 12–24. Capsules 15–20 mm. Seeds brown, sometimes mottled, 14–18 mm. 2n = 36.
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