fl> o s t e I i i a 205 



tion, on the bulbous end of the stipe, 

 of two groups of ribbon-like leaves six 

 inches or so in width and twenty-five 

 or thirty feet in length. In Lessonia 

 the splitting results in a tree-like system 

 of branches, the ultimate branchlets of 

 which are produced terminally as slender, 

 flat leaflets, and the whole plant may 

 be six feet in length or more. 



Not only by the longitudinal split- 

 ting which has been described and the 

 subsequent growth and differentiation of 

 the parts do the mature forms come to 

 differ from the young in general appear- 

 ance, but also in some genera by the 

 regular production of outgrowths upon 

 the stipe or lamina or upon both. In 

 Pterygophora, for example, the young 

 plant is of the ordinary simple unilami- 

 nate appearance, but after it has be- 

 come a few inches in length out- 

 growths appear right and left upon 



