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22c. Thalictrum Sect. Physocarpum de Candolle, Syst. Nat. 1: 171. 1817.
Physocarpum (de Candolle) Berchtold & J. Presl, not Physocarpon Necker ex Rafinesque 1840, not Physocarpus Maximowicz; Sumnera Nieuwland
Inflorescenes panicles to nearly corymbs. Flowers bisexual; sepals 5; filaments strongly clavate, petaloid. Achenes long-stipitate.
Species 45 (2 in the flora): temperate regions, North America, e Asia.
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