Ch. Ill, S] FORMS OF FOLIAGE LEAVES 



67 



veinlets almost in\isible. In some the veins gradually 

 converge towards tip and base, as in Grasses and many 

 Lilies ; in others they rmi out strictly parallel from a midrib, 

 as in Banana (Fig. 28 j, while in still others they radiate from 



Fig. 37. — Tjijical lobed and compound leaves : X i- Oak, Locust, 

 High Bush Cranberry, Virginia Creeper, Orange. The single leaflet of the 

 latter is jointed to the petiole, "which in related forms bears two additional 

 leaflets. 



the base, producing a fan shape, as in the Fan Palms (Fig. 

 34). And of course there occur all gradations and com- 

 binations. 



There is also close coimection between the venation, and 

 the lobing and corn-pounding of leaves. Some kinds become 

 deeply lobed between their main veins, and therefore pix- 

 NATELY LOBED, as in Oak (Fig. .37), or PALiLiTELY LOBED, as 

 in Maple. The .significance of this lobing is not yet under- 



