EXPLANATION OF TERMS. 



xxiii 



Cordate : the same as ovate, but with sides forming a notch at the base. 

 (Fig. 28.) 



Obcordate : a reversed cordate. 



Spatulate : rounded at the apex and tapering towards the base, like a 

 spatula. (Fig. 22.) 



Orbicular : nearly circular in outline. 



Peltate : as orbicular, but having the petiole attached at or near the 

 middle of the leaf. (P^IG. I.) 



Reniform : similar to the base of a cordate leaf, the apex, however, being 

 shorter and more rounded, (Fig, 2.) 



Axillary. Raceme. Spike. 



FIG. 29. FIG. 30. FIG. 31. 



Auriculate : when at the base the leaf's sides are prolonged into two ears, 

 or lobes. 



Sagittate : when pointed at the apex and with acute basal lobes turned 

 backward, suggestive of an arrow-head. 



Much affected also is the appearance of leaves by the peculiarities of their 

 margins, and to the different forms of which the following terms are in 

 reference : 



Entire : when the leaf margins form an unbroken line. (FiG. 24,) 



Undulate : when the margins are wavy. 



