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In botany, the petiole is the small stalk attaching the leaf blade to the stem. The petiole usually has the same internal structure as the stem. Outgrowths appearing on each side of the petiole are called stipules. Leaves lacking a petiole are called sessile, or clasping when they partly surround the stem. Clasping leaves of the Poaceae have an extra structure called the ligule. In Acacia koa, the phyllodes are leathery and thick, allowing the tree to survive stressful environments. The petiole allows partially submerged hydrophytes to have leaves floating at different depths; the petiole being between the node and the stem. >Petiole is pronounced "pet-ee-ohl" and comes from Latin petiolus, or peciolus "little foot," "stem", an alternate diminutive of pes "foot." The regular diminutive pediculus is also used for "foot stalk".
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