THE COMPOUND LEAF 



35 



FIG. 29. 

 Leaf of poison sumac. 



41. The Virginia creeper leaf has five leaflets, 

 or is quinate (parts in fives). The dewberry and 

 the poison ivy have three 



leaflets, or are ternate (part 

 in threes). The jeffersonia 

 (Fig. 30) has two leaflets, 

 or is binate. Is this jef- 

 f ersonia leaf essentially pal- 

 mate, or essentially pinnate ? 



42, A leaf of the squirrel- 

 corn (or dicentra) is shown, 

 Fig. 31. It is evidently 

 ternate and palmate ; but 

 each part is again divi- 

 ded into three, and each 

 of these is again variously 

 divided and cut. The 

 leaf, therefore, is biternate 



(or twice ternate) . The FIG. so. 



Binate leaf of jeffersonia. 



