Herbs, perennial, erect, robust, basally lignified, 0.8-4 m tall, yellow lactiferous. Roots stoloniferous. Stems glaucous, terete, hollow, herbaceous, smooth. Leaves alternate, petiolate; blade pale glaucous abaxially, green or blue-green adaxially, broadly ovate or suborbicular, abaxially pilose or glabrous, adaxially glabrous, basal veins usually 5, lateral veins 1-3 pairs, veinlets netted, base cordate, usually 7-or 9-lobed, apex acute, obtuse, acuminate, or rounded; lobes undulate to serrulate. Flowers small, many forming large terminal panicles. Flower buds clavate or terete. Sepals 4, milky. Petals absent. Stamens 8-12 or 24-30; filaments filiform, not longer than anthers; anthers oblong. Ovary 1-loculed, 2-carpellate; ovules 1 or 4-6, basifixed or bilaterally attached; styles very short; stigmas 2-lobed. Capsule narrowly obovoid, oblanceolate, or suborbicular, shortly petiolate, 2-valvate. Seeds 1 and basifixed, or 4-6 and bilaterally attached, ovoid.
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Herbs , perennial, caulescent, usually glaucous, from rhizomes; sap yellow. Stems hollow, leafy. Leaves alternate, petiolate; blade 1-2× subpalmately or pinnately lobed. Inflorescences terminal, paniculate, many-flowered; bracts present. Flowers: sepals 2, distinct; petals absent; stamens 25-30 [8-12]; pistil 2-carpellate; ovary substipitate, 1-locular; style short; stigma 2-lobed. Capsules nodding, substipitate, 2-valved, dehiscing from apex. Seeds 4-6 [1], arillate [not arillate]. x = 10.
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