36 



BOTANICAL GAZETTE 



[JANUARY 



where the curvature also occurs. Roots appear also at the 

 basal nodes and sometimes at the cut basal surface of these 



Fig. i 8 



stems. When the basal leaf is preserved and this leaf is below 

 (fig. 15), no root formation takes place generally, or not for a long 



Fig. 19 



time at least; while when the leaf is above (fig. 23), such root 



formation takes place in the basal node on the 

 under side of the stem opposite the leaf. When 

 the cortex is above and the leaf at the apex, root 

 formation will occur, but chiefly or most rapidly 

 in the basal node, and later in the next or the 2 

 nodes next to them (fig. 20). When the leaf is 

 at the base or when the stem has no leaf, no root 



formation occurs in the cases where the cortex 

 above, at least for a long time. 





Fig. 20 



1 



