Ch. 1X.1 



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. 



'91. Orbicular, or the round leaf; the Nasturtio'n affords an 

 example of this kind; (see Fig. 27. a ;) this is also peltate^ 

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

 resembling a shield. 



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

 sometimes called kidne y-form ; the Ground-ivy (Glechorm) 

 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 L'atin cor, the heart,) or heart-shaped. 

 Fig. 27, (c,) represents a cordate leaf with 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 oi 

 the Star-llower, Aster cordifolium. 



Fig. 28. 



190. What terms express the form of the leaf 7 



191. Describe an orbicular leaf. 

 19-2. What is a reniform leaf] 

 193 What is cordate 7 



