LOWER PINNAE OF PERSIAN WALNUT LEAVES 



Figure 12. Intermediate leaf-forms of the Persian walnut at Chico, California, 

 with the lateral ipinnae reduced in number and of difTerent forms. The small leaf in 

 the middle has only one pair of lateral pinnae, and these unequal. The left-hand 

 pinna of this leaf is cut away on the lower side for half its length, while the right- 

 hand pinna has the leaf-web complete and of nearly equal width on both sides of the 

 midvein. The lower pinnae of the left-hand leaf are strongly curved and completely 

 one-sided, with no leaf-web at all on the lower, or proximal, side of the midvem. 

 The right-hand leaf shows an even stronger curature of the basal pinnae, but only 

 at the base where the wings of the leaf-base run out upon the pinna. (Natural size). 



