500 



BOTANICAL GAZETTE 



[JUNE 



Figs. 19-33. — Fig s - 19-22, series showing bundle supply from primary shoot to 

 secondary shoot, also transition from normal primary cylinder (fig. 19) to organiza- 

 tion into two bundles supplying secondary shoot (fig. 21); figs. 23-27, series showing 

 vascular supply to two secondary shoots on primary axis; figs. 28-30, series showing 

 vascular supply when primary shoot becomes functionally vegetative second season; 

 two large bundles of figs. 28 and 29 belong to secondary shoot, circle of small bundles 

 to primary shoot; figs. 31-33, series through primary shoot at least two years old, 

 showing: fig. 31, usual primary shoot cylinder; fig. s 2 j large gap formed by bundle 

 supply to secondary shoot (note that bundle supply to secondary shoot is laterally 

 continuous with primary axis cylinder and has not formed branch gap as for normal 

 axillary structure); fig. 33, through branch scar (with crossed lines), and fertile 

 scale; X24. 



