LLEjrENTS OK STRUCTURAL BOTANY. 



7] 



on oi.iiujjiie sides of the stem, and so are described as 

 opposite. Sometimes tbero ere several 

 leaves at the same node, in which case 

 they are xthnrled or ve-ticiUaic (Fig. 

 105). 



100. Forms of Foliage-Ler.ves. 

 Leaves present an almost endless va- 

 riety in their forms, and accuracy in 

 describing any given leaf dejiends a 



good deal upon the ingenuity of the student in selecting 



an I comblmug terms. Tlie chief terms in use will be 



given here. 



Compare a leaf of the Kound-leaved Mallow with one 



of Red Clover (Figs. 10(5, 107). Each of them is fur- 



Fi". 105. 



Fig. IOC. Fig. 107. 



nished with a long petiole and a pair of stipules. In 

 the blades, however, there is a- difference. The blade oi 

 the lormer consists of a situjle piece ; that of the latter- is 

 in three separate pieces, each of which is called a leaflet, 

 but all of which, taken collectivelv, constitute the blj^lc 



"><: 



