72 NOMENCLATURE OF THE LEAF. 



28. Much Compound .-The much compound leaves are 

 those, in which the common leaf-stalk supports secondary 

 petioles, and these, in their turn, supporting ternary 

 leaf-stalks. There are two varieties, the triternate and 

 the tripinnate. 



a. Triternate when the common foot-stalk supports on its apex, 

 three secondary petioles, which each support three ternary petioles, 

 and on every one of these, three leaflets, as in the common colum- 

 bine and nine-leaved fnmatory. (F. 172.) 



b. Tripinnate when along the sides of the common foot-stalk, 

 there are secondary foot-stalks supporting the ternary, which are 

 pinnate, as in the carrot. (F. 173.) 



