~ 430 BOTANICAI GAZETTE [JUNE 
of dissection. When multicipital branching occurs, the new 
secondary rosettes consist of leaves of juvenile form, that is, tending 
to be smooth and entire (fig. 3). Each daughter rosette which 
persists then repeats the history of the parent rosette with respect 
to leaf form, as well as with respect to flowering habits and eventual 
AN 
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Fic. Fic. 2 
Fics. 1, 2.—Fig. 1, young seedling showing relatively entire leaf form and 
unbranched crown; fig. 2, seedling at end of flowering period showing highly dis- 
sected leaf form, scars of juvenile leaves of first year, and beginnings of root fission. 
rejuvenation (fig. 4). Certain modifying factors must be con- 
sidered. For example, the supply of reserve food in rejuvenating 
roots results in rosettes that are often unusually vigorous and 
decidedly different in appearance from seedlings of the same 
degree of leaf dissection. Again, it not infrequently happens 
that secondary rosettes on the same root are of different ages, and 
hence different leaf form (fig. 4). This is bound to confuse an 
observer who does not excavate the plant and inspect it carefully. 
