In Botanical, a petiole (of Latin petiolus : small foot) indicates the stalk of a Feuille, connecting the limb to the Tige. The petiole with the structure interns of a Tige.

When that it is widened until replacing the sheet in its function, one speaks about Phyllode. A sheet without petiole, or with very short petiole, is known as sessile.

Some petioles with the functions specific to a plant:

• the Sensitive : it allows the movement of the sheets.
• the sweet chestnut of water: it allows the floating of the plant.

In absence of petiole, one speaks about sessile Feuille.

In zoology, the petiole indicates a Gastre lengthened.