Petiole--the stalk of a leaf; a leaf without a petiole is sessile

Blade--the flat, expanded portion of the leaf

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Stipule--flat, often leaf-like flap below a leaf. Not all leaves have stipules. Stipules can be highly modified into tendrils, spines, scales, etc. Do not confuse a stipule with the

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Axillary bud--the bud in the axil--the angle between the leaf and the stem.

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