Floral morphology of genera in the tribe Thalictroideae (Ranunculaceae) displays the diversity of the entire family. "Enemion" and "Thalictrum" lack petals entirely, wheras in "Thalictrum dioicum" petaloidity of the sepals is also lost. The novel organ of the staminodium is present only in "Semiaquilegia" and "Aquilegia", the latter is also the only which displays nectar spurs.