Sympetalae

thumb|A flower showing sympetally (fused petals), a characteristic of the Sympetalae subclass (biology)|subclass|alt=Diagram of sympetalous flower

Sympetally (fused petals) is a flower characteristic that historically was used to classify a grouping of plants termed Sympetalae, but this term has been abandoned in newer molecular based classifications, although the grouping has similarity to the modern term asterids.