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 tlie 

 veining, 'Vi\\'&W\^x pinmtely veined Qx palmateli/ veined. In tiie former tlie 

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

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

 apex of the petiole ; as tlie figures show. 



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

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

 first is said to be pinnateli/ lobed (in the special sense), the second ^innately 

 cleft (or pinnatijid in Latin form), the third pinna tely parted, the fourth 

 pinnateli/ divided, or pinnatisected. 



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

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

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

 meaning (but now less coinmouly 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. 

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



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

 Latin form), trisected. And so for higher numbers, &^fce-lobed. Jive-cleft, 



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

 pinnately divided , leaves. 



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

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



