FORM AND STRUCTURE 



FORMS OF LEAVES. 



By General Outline we mean the outline form of the leaf, 

 disregarding marginal indentations and slight irregularities. 



Fig. io. Fig. ii. Fig. 12. Fio. 13. 



Fig. 14. Fig. 15. 



Fig. 16. 



Fig. 17. 



Fig. 18. 



Fig. 19. 



The principal forms found in the leaves of trees are the 

 following : 



Needle-shaped, like the leaves of the Pine. (Fig. lo.) 



Linear, a narrow elongated form. (Fig. ii.) 



Oblong, two or three times longer than wide with sides nearly 



parallel. (Fig. 12,) 

 Elliptical, oblong with a flowing outline, the two ends alike in 



width. (Fig. 13.) 

 Oval, broadly elliptical. (Fig. 14.) 



Lanceolate, broader at base than apex, but narrow. (Fig. 15.) 

 Oblanceolate, the lanceolate reversed. (Fig. 16.) 



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