ABNORMAL "FLOWERS" OF HELENIUM AUTUMNALE, L. 953 



Fig. 217 shows how the ray-florets of the secondary capitula exhibit 

 the curious semi-tubular or trumpet-shaped condition. It affords at the 

 same time an excellent example of the extreme proliferating habit of the 

 primary ray-florets. 



A further fact in connection with these various virescent productions 

 may be mentioned, viz. that the bracteole subtending each individual floret 



Fig. 218. — Capitulum showing Proliferation of Ray- florets and Produc- 

 tion OF NORMALLY FORMED SECONDARY HEADS. 



of the disc has become abnormally elongated, and at the same time 

 green. 



And I would point out the interesting physiological fact of spiral, 

 downwardly directed torsion, exhibited by such capitula as those of figs. 

 212 and 214. 



