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22e. Thalictrum Sect. Heterogamia (de Candolle) B. Boivin, Rhodora. 46: 432. 1944.
Thalictrum [unranked] Heterogamia de Candolle, Syst. Nat. 1: 172. 1817 (as Heterogama)
Inflorescences panicles, racemes, or corymbs. Flowers unisexual (rarely also bisexual in T . debile and T . fendleri ); sepals 4(-6); filaments filiform (to slightly clavate in T . heliophilum ). Achenes sessile to nearly sessile.
Species 25 (11 in the flora): North America, Mexico.
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