Stipule
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In botany, a stipule is an outgrowth typically borne on both sides of the base of a leafstalk. They are primarily found among dicots and rare among monocots. Stipules are considered part of the anatom
Glandular stipule of Euphorbia pteroneura
Stipular spines on the mesquite tree (Prosopis pallida)
Fused together and leaf-like stipules of Alchemilla mollis
Leafy stipules at the base of a Rose leaf (Rosa canina)
Leaf
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A leaf is a principal appendage of the stem of a vascular plant, usually borne laterally above ground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage"
Stipule
…base of a leafstalk (the petiole). They are primarily found among dicots and rare among monocots. Stipules are considered part of the anatomy of the leaf of a typical flowering plant, although in many species they may be inconspicuous —or sometimes entirely absent, and the leaf is then termed exstipulate…
Leaf of Tilia tomentosa (silver linden tree)
Vein skeleton of a leaf. Veins contain lignin that make them harder to degrade for microorganisms.
Near the ground these Eucalyptus saplings have juvenile dorsiventral foliage from the previous year, but this season their newly sprouting foliage is isobilateral, like the mature foliage on the adult trees above.