st~ 



193 



i 



198 



195 



POPULUS NIGRA, VAR. PYRAMIDALIS, X 2. WlNTER-RUDS. 



Fig. 191. Terminal bud showing one pair of persistent stipules, st, st, belonging to 



a leaf of a previous season. 

 Fig. 192. Terminal bud showing one from each of two pairs of persistent stipules, 



st', st". 

 Fig. 193. Axillary bud showing only one of the outer pair of stipules, si. 

 Fig. 194. I, third leaf in the bud, often dying in winter ; st, si, its stipules shown 



separately above. 

 Fig. 195. I. fifth leaf in the bud ; st,st, its stipules. 

 Fig. 196. The same shown separately. 

 Fig. 197. I, eighth leaf in the bud ; st, st, its stipules. 

 Fig. 198.?, outer face of eighth leaf ; st, st, its stipules spread out. 



