These may or may not be present. Legumes leaves are either simple or compound. Simple leaves - have a single leaf blade. Compound leaves - blade is divided up into two or more leaflets. The leaf venation is the pattern of veins in the leaf blade.
All grasses have parallel venation.
This is a nonbranching pattern in which all the veins are parallel to each other and run the length of the leaf blade. All legumes have netlike venation. This is a many branched pattern of veins. Leaves come in many different shapes. Some of the more important differences in legumes are shown in Fig.