Petiole (botany)

In botany, the petiole ('pet-ee-ohl'; from Latin peciolus "little foot," diminutive of pediculus "foot stalk," itself a diminutive of pes "foot") 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 leaf. Clasping leaves of the Poaceae have an extra structure called the ligule.
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