Adnation

In botany, adnation is the fusion of two or more whorls of a flower, e.g. stamens to petals, within angiosperms (flowering plants).

[1] This is in contrast to connation, the fusion among a single whorl.

[2][3]

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The tropical pitcher plant Nepenthes adnata is named for its adnate leaf bases
The stamens of Primula vulgaris are adnate to the corolla