LECT. X.] COMPOUND LEAVES. 525 



in Helleborus niger, Q8; but according to the 



definition of the compound leaf which we have 

 adopted, the pedate is merely a deeply divided 

 simple leaf, having a close affinity to the palmate, 

 or rather, as Sir J. E. Smith observes, who never- 

 theless regards it as a compound leaf, to " those 

 " simple leaves which are three-ribbed at the base." 



3. The third division of compounded leaves, 

 the more than doubly compound, comprehends 

 those in which the common petiole supports se- 

 condary petioles, which in their turn support ter- 

 nary petioles. 



When the common petiole supports, on its 

 apex, three secondary petioles, which each sup- 

 ports three ternary petioles, and every one of these 

 three leaflets, the leaf is termed thrice ternate 

 (tritematum s. triplicato-ternatum), 99, (p. 526) ; 

 and when along the sides of the common petiole, 



