No. 436.] LOCALIZED STAGES IN PLANTS. 25 I 



fourth leaf has a still more pointed form, the widest portion still 

 nearer the base which is now deeply auricied, Fig. 23. The fifth 

 leaf has still more lateral teeth. Fig. 24, and so on. 



The spring growth of this plant is of two distinct kinds. In 

 one the shoots come from underground and are succulent, grow- 

 ing rapidly with long internodes, in the other the growths come 

 from the part of the plant above ground which survived from 

 the previous year. This growth is not so rank and the inter- 

 nodes are much shorter ; a decided difference in the leaves of 

 the two forms is noted. 



In the growth from underground the stages passed through 

 may be represented by the figures of leaves of seedlings. Figs. 

 20-24, the stages being exactly comparable to those of the seed- 



ling. In the growth from above ground, however, there is a 

 decided deviation from this form. The earliest leaves are taper- 

 ing to the petiole and with but one tooth on a side, Fig. 25. 

 The second leaf has two teeth on a side but decidedly different 

 from those of leaves from underground shoots. In both how- 

 ever the widest portion is near the distal end. The growth con- 

 tinues, Figs. 26-29, with the number of teeth increasing and 

 becoming doubly serrate, Figs. 30-32. The greatest width con- 

 tinues to be at the top. 



Beneath the flower however the leaf changes in its characters. 

 The base becomes auricied, Fig. 33, like the leaves in the seed- 

 ling and in the growth from the ground. Also the greatest 



