Reticulate venation is found in dicot leaves while in monocot leaves venation is of parallel type. Mention one exception to this generalization.
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.