Leaf Venation
Types of leaf venation include:
Pinnate
Parallel
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Dichotomous
Palmate
Reticulate
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Triplinerved
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Leaf Venation
Pinnate
In pinnate leaf venation, the veins are produced on either side of the central
main vein (midrib), which extends from the petiole to the leaf edge.
Sublateral
vein
Lateral
vein
Midrib
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Petiole
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Leaf Venation
Palmate
In plamate venation, the main veins radiate from a central point at the petiole.
Each main vein extends from the petiole to the tip of a lobe.
Main
veins
Petiole
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Leaf Venation
Reticulate
Reticulate or net-veined leaves have many branched minor veins.
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Leaf Venation
Dichotomous
Dichotomous venation occurs in Gingko. Numerous veins radiate from the base
of the leaf that branch near the upper leaf surface to form a Y.
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Leaf Venation
Triplinerved
In triplinerved venation, there
are two lateral veins that
branch from the midrib in the
upper portion of the leaf blade.
Lateral
vein
Lateral
vein
Midrib
Petiole
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Leaf Venation
Parallel
Leaves with parallel venation are diagnostic for monocots. The veins extend
parallel to the outer leaf edge and each other.
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