LECT. IX.] LEAVES. 499 



Crenated (crenatus), 42, implies that the in- 

 dentations of the margin are blunt and rounded, 

 and do not incline to either extremity of the leaf. 

 The crenatures themselves may be crenated, in 

 which case the margin is termed doubly crenated 

 (duplicato-crenatus); or they may be of a doubt- 

 ful form, being neither completely rounded nor 

 yet pointed, in which case it is termed dent at o- 

 crenatus, 43 ; and crenulated (crenulatus), 44, if 

 they are very shallow and at the same time perfect. 



When the marginal denticulations, whatever 

 form they assume, are terminated with sharp, rigid 

 spines, the margin is termed spinous (spinosus), 

 45; and as a comparative term, a leaf is said to 

 be unarmed (inerme), when it occurs in a species 

 or a variety belonging to a tribe of plants, which 

 has for the most part spinous-leaved species. 



Bordered. 



When the substance of the margin of a leaf 

 differs from that of the expansion, the leaf is con- 

 sidered as bordered ; and according to the charac- 



KK2 



