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structure of a leafclick to hear

structure of a leaf blade margin tip petiole midrib vein sheath stipule leaf axil

blade click to hear

Main part of the leaf, rich in chlorophyll; it can vary markedly in shape, depending on the type of rib and size of indentation.

margin click to hear

Part that forms the outline of the leaf blade.

tip click to hear

Apex of the leaf blade, at the opposite end from the part attached to the petiole; this part can vary markedly in shape.

petiole click to hear

Narrow part of the leaf connecting the blade to the stem.

midrib click to hear

Hollow projection that extends the petiole into the blade and carries sap; it forms the basis of the leaf’s skeleton.

vein click to hear

Branching of the midrib that carries sap to the various parts of the blade; it also functions as the leaf’s skeleton.

sheath click to hear

Distension of the petiole, partly or completely surrounding the stem.

stipule click to hear

Small outgrowth at the base of the petiole in certain leaves.

leaf axil click to hear

Point at which the petiole attaches to the stem node.