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Intramarginal vein

An intramarginal vein is a vein of constant thickness (much thinner than the midrib) just inside the margin and extending from the base to the apex of the leaf blade (or leaflet blade in the case of compound leaves). Lateral veins run from the midrib to the intramarginal vein. To be classed as an intramarginal vein rather than looping lateral veins there should not be any major bends. However, slight indentations may occur at the junction with the main lateral veins.

L20 present L21 absent