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Leaf of Pyrus calleryana with petiole
In botany, the petiole (/ˈpiːti.oʊl, ˈpɛti-/), commonly known as the leaf stem or leaf stalk, is the stalk that attaches the leaf to the twigs, branches or stems of a plant. The terms petiolate and apetiolate are applied, respectively, to leaves with and without petioles.