CH. Ill, 8] FORMS OF FOLIAGE LEAVES 



67 



veinlets almost invisible. In some the veins gradually 

 converge towards tip and base, as in Grasses and many 

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

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



FIG. 37. Typical lobed and compound leaves ; X . Oak, Locuot, 

 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 connection between the venation, and 

 the lobing and compounding of leaves. Some kinds become 

 deeply lobed between their main veins, and therefore PIN- 

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

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



