74 



Elementary Botany 



of the veins of the leaves in the two great groups of flowering 

 plants. 



In Dicotyledons the smaller veins run together, forming a 

 complete network known as reticiilate venation (fig. io8) 



Fig. io8. — Reticulately veined leaf q\ Acer acufifrliiim. 



In Monocotyledons, as a rule, there is no network formed 

 between the principal veins, and the venation is said to be 



Fig. 109.— Parallel venation. 



parallel (fig. 109), (Some Monocotyledons, however, as the 

 Aroids, have net-veined leaves.) 



There are varieties of both net-veined and parallel-veined 

 leaves. 



