Define venation. What are the different types of venation found in the leaves?

Arrangement of veins in the lamina is called venation. It is mainly of two types

1. Reticulate Venation — In this type of venation, veins and veinlets are irregularly distributed in the lamina, forming a network. Example - Mango, Peepal, etc.
2. Parallel Venation — In this type of venation, veins run parallel to each other. Example - Banana, Maize, etc.