Ch. IX.] LEASES. . 49 



190. The form of the leaf is expressed by various terms, 

 borrowed from the names ot different objects; as digitate. 

 (from digitus, the finger,) &c. For the explanation of these 

 different terms you must consult the vocabulary as often as 

 you find those you do not understand. We will, however, il- 

 lustrate some of the most common forms of simple leaves. 



Fig. 27. 



191. Orbicular, or the round leaf; the Nasturtion aUords an 

 example of this kind; (see Fig. 27, ay) this is also peltate, 

 having its petiole inserted into the centre of the leaf, and thus 

 resembling a shield. 



192. Reniform, (from the Latin ren, the kidney,) or as it is 

 sometimes called kidney-form; the Ground-ivy (Glechoma) 

 has a leaf of this kind. (See Fig. 27, b ;) It is crenate, or has 

 a margin with scolloped divisions, ciliate, being fringed with 

 hairs like eyelashes. 



193. Cordate, (from the Latin cor, the heart,) or heart-shaped. 

 Fig. 27, (c,) represents a cordate leaf Avith an accuminated point ; 

 that is, acute and turned to one side ; the margin is serrated; 

 an example of this kind of leaf may be seen in one species ol 

 the Star-flower, Aster cordifolium. 



Fis. 28. 



d 



190. What terms express the form of the leaf? 



191. Describe an orbicular leaf. 

 19-2. What is a reniforai leaf? 

 193 What is cordate? 



