Stems to 1 m; apical leaf whorls not densely crowded. Leaves light green to yellow-green, fine-textured. Leaf blade simple or forked into 2-10 ultimate segments (forking of largest leaves 3d or 4th order), segments sometimes conspicuously inflated, mature leaf whorls 2.5-6 cm diam., marginal denticles weak and inconspicuous, not raised on broad base of green tissue, sometimes nearly absent; 1st leaves of plumule simple. Achene green or dark brown, body (excluding spines) 3-4.5 × 2-3 × 1-2 mm, basal spines 2 (rarely absent), straight or curved, 0.3-4.5 mm, marginal spines (0-)2-20, 0.1-4 mm, terminal spine straight or curved, 1.5-7.5 mm, margins slightly winged.
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