Tulsi leaves have reticulate venation. This means that the veins on the leaves form a net-like pattern. The centre of most reticulate venation leaves has a central vein running the length of the leaf. This is called the mid-rib and from here, smaller veins branch out, forming a complicated network of webs. This type of venation is most commonly observed in dicotyledons.
Reticulate venation is also called as pinnate venation.
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Further Reading: Leaves: Morphology, Types & Modification