56 



LEAVES. 



[SECTION 7 



leaf compound. Here, using the Latin form, the leaf is said to be bisected, 

 trisected (Fig. 155), etc., according to the number of the divisions. 



141. The Mode of Lobing or Division corresponds to that of the 

 veining, whether pinnately veined or palmately veined. In the former the 

 notches or incisions, or sinuses, coming between the principal veins or ribs 

 are directed toward the midrib : in the latter they are directed toward the 

 apex of the petiole ; as the figures show. 



142. So degree and mode of division may be tersely expressed in brief 

 phrases. Thus, in the four upper figures of pinnately veined leaves, the 

 first is said to be pinnately lobed (in the special sense), the second pinnately 

 cleft (or pinna 'tifid in Latin form), the third pinnately parted, the fourth 

 pinnately divided, or pinnatisected. 



143. Correspondingly in the lower row, of palmately veined leaves, the 

 first is palmately lobed, the second palmately cleft, the third palmately 

 parted, the fourth palmately divided. Or, in other language of the same 

 meaning (but now less commonly employed), they are said to be digitately 

 lobed, cleft, parted, or divided. 



144. The number of the divisions or lobes may come into the phrase. 

 Thus in the four last named figures the leaves are respectively palmately 



three-lobed, three-cleft (or trifid), three-parted, three-divided, or better (in 

 Latin form), trisected. And so for higher numbers, &sfve-lobed,fve-cleft, 



Fig. 148, pinnately lobed; 149, pinnately cleft; 150, pinnately parted; 151, 

 pinnately divided, leaves. 



Fig. 152, palmately three-lobed ; 153, palmately three-cleft ; 154, palmately 

 three-parted ; 155, palmately three-divided or trisected, leaves. 



