Adnation

thumb|The tropical pitcher plant [[Nepenthes adnata is named for its adnate leaf bases]]

In botany, adnation is the fusion of two or more whorls of a flower, e.g. stamens to petals, within angiosperms (flowering plants). This is in contrast to connation, the fusion among a single whorl. thumb|left|The stamens of Primula vulgaris are adnate to the corolla