Dear student
The arrangement of veins on leaf blade is called venation.
The two arrangement of venation are :-A)Parallel venation
B)Reticulate venation
A)Parallel venation in which the veins are parallel to each other.It involves small veins .It can be seen in monocot plants.
B)Reticulate venation in which network or web like arrangement seen all over the leaf blade .It can be seen in dicot plants.
Regards