A parallel venation that has more than one major vein is called multivenous parallel venation. There are two types of multivenous parallel venation.
Convergent multiveinal parallel veining: In the multiveinal venation in which more than one main vein originates from the base of the leaf blade and joins at the top of the blade is called convergent multiveinal parallel veining. For example, bamboo.
Divergent multiveinal parallel venation: The multiveinal venation in which more than one main vein originates from the base of the leaf blade and spreads to different ends of the blade is called divergent multiveinal parallel venation. For example, rhythm.