LEAF-FORMS AND FIGURES, 17 
16. In the next four kinds of leaves you will notice that 
the broadest place is midway between the base and apex. 
Thus the orbicular (Fig. 14), or rounded, leaf is about as 
bread as it is long. The oval leaf (Fig. 15) is about one-third 
longer than broad. This Plum leaf is an example. The el- 
liptical (Fig. 16) is about twice longer than broad, and the 
oblong (Fig. 17) is three or four times longer than broad. 
Here are examples. 
Fig. 14. Orbicular leaf of Winter-green (Pyrola). 
Fig. 15. Oval leaf of the Plum-tree. 
Eig. 16. Elliptical leaf of Black Haw. 
Fig. 17. Oblong leaf of a Willow. 
17. We next have four varieties of forms which are broader 
towards the apex than base. First, the obovate (Fig. 18), 
like this leaf of the Smoke-tree. Its outline is like that of 
16. When is the figure of a leaf called orbicular? Will you show me 
specimens? Describe an oval leaf, and give specimens. Describe an ellip- 
tical leaf, and give examples. Describe an oblong leaf, and give examples. 
17, When will the figure of a leaf become obovate? Give examples of 
