Parallel venation is of two types they are:
(i) Pinnately parallel venation
(ii) Palmately parallel venation.
In pinnately parallel venation there is only single main vein called as midrib from where many small veins arises which are perpendicular to the midrib. All the small veins are parallel to each other. Example: Banana.
In palmately parallel venation numbers of veins arise from the base of lamina they are again divided into
(i) Palmately parallel (Divergent)
(ii) Pinnately parallel (Convergent).
In pinnately parallel (Convergent) all the veins that arise from the base of the lamina converge at the apex of the leaves, so called as the convergent type. Example: Grass
In the palmately parallel (Divergent) type the veins starting from the leaf base diverge or spread out towards the periphery so it is called as palmately divergent type. Example: Borassus.