Herbs, erect, basally lignified, yellow lactiferous. Stems 0.8-1 m, usually pistachio-colored, glaucous, smooth, hollow, much branched in inflorescence. Leaves: petiole 4-11 cm, upper explanate, usually not channeled; blade glaucous abaxially, green adaxially, broadly ovate or suborbicular, 5-14 × 5-12 cm, abaxially villous, adaxially glabrous, basal veins usually 5, lateral veins 1 pair, rarely 2, veinlets netted, base cordate, usually 7-or 9-parted or-lobed, apex acute, obtuse, or rounded; lobes semicircular, flabellate, or oblong, margin undulate, incised, serrate to serrulate. Panicles large, multiflorous, 15-30 cm, arising from stem and branch apices. Pedicel 2-10 mm. Flower buds terete, ca. 5 mm. Sepals narrowly oblong, cymbiform, ca. 5 mm. Stamens 8-12; filaments very short; anthers 3-4 mm, longer than filaments. Ovary obovoid, 1-3 mm; styles very short; stigmas 2-lobed. Capsule suborbicular, ca. 5 mm in diam. Seeds 1, basifixed, erect, ovoid, ca. 1.5 mm, seed coat foveolate, not carunculate. Fl. and fr. Jun-Oct. 2n = 10*, 20*.
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