The arrangement of veins and the veinlets in the lamina of leaf is termed as venation.
When the veinlets form a network, the venation is termed as reticulate.
When the veins run parallel to each other within a lamina, the venation is termed as parallel.
Leaves of dicotyledonous plants generally possess reticulate venation, while parallel venation is the characteristic of most monocotyledons.
There are a few exceptions like Smilax and Discorea are monocots with reticulate venation and Calophyllum and Eryngium are dicots with parallel venation.
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