i8 



DEVELOPMENT OF SIUM CICUTAEFOLIUM. 



near the inflorescence, probably because their senescence has not pro- 

 gressed so far. 



Senescence reaches its culmination in the region of the flower. Re- 

 markably interesting conditions were found in the inflorescence men- 



Fig 8. Proliferations (re- 

 juvenations) of an Inflor- 

 escence of Sium cicutaefo- 

 lium. Drawn by J.Marion 

 Shull from a photograph, 



tioned above which had been 

 submerged before the devel- 

 opment of the flowers. All 

 the flowers had given place to 

 proliferations (fig. 8), i. e., 

 the flower-buds were rejuve- 

 nated by the submergence ; 

 and just as the flowers repre- 

 sent the extreme of the senes- 

 cent condition, the prolifera- 

 tions presented extreme juve- 

 nile conditions, showing sev- 

 eral types of leaf which are 

 simpler than any which were 

 found in the seedlings, and 

 usually reaching the condition of the first nepionic leaf at the third or 

 fourth leaf of the proliferation. Some of the proliferations were more 



