nETEEOPHYLLY. 331 



dependent on a greater or less degree of lobing of the 

 margin of tlie leaf; thus, in the yellow jasmine, almost 

 every intermediate stage may be traced from an ovate 

 entire leaf to one very deeply and irregularly stalked. 

 Broussonettia papyrifera, and Launis Sassafras^ and the 

 species of Panax, may be mentioned as presenting 



Pig. 177, Syringa peraica laciniaia, showing polymorphous leaves. 



this condition. Sometimes in the last-named genus, 

 as also in Pteridc^hyllum, every gradation between 

 simple and compound leaves may be traced. The 

 horse-radish (Gochlearia, Ai'moracia) may also be in- 

 stanced as a common illustration of polymorphism in 



