374 THE PLANT PHYLA 



culminating on the one hand in the 

 Eupatoriaceae, and on the other in the 

 Lactucaceae. 



KEY TO THE FAMILIES OP ASTERALES 



A. Pappus not capillary; plants typically large 



and coarse. 



I. Receptacle chaffy. 



1. Usually with ray flowers 287. Heli- 

 anthaceae. 



2. Without ray flowers 288. Ambros- 

 iaceae. 



II. Receptacle naked (rarely chaffy). 



1. Anthers tailless. 



a. Involucral bracts mostly in 2 



series 289. Heleniaceae. 



b. Involucral bracts in many 



series 290. Arctotidaceae. 



2. Anthers tailed or mucronate 291. 

 Cakndulaceae. 



B. Pappus bracteose, none, or capillary; recep- 



tacle usually naked; plants typically 

 low to medium sized. 



I. Usually without ray flowers; anthers 

 tailed 292. Inulaceae. 



C. Pappus from short bracteose to capillary or 



none; receptacle naked; plants typi- 

 cally medium sized. 



I. Usually with ray flowers 293. Aster- 



aceae. 



II. Without ray flowers; style branches 



filiform, hispidulous. 294. Vernoni- 

 aceae. 



III. Without ray flowers; style branches 

 clavate, papillose 295. Eupatoriaceae. 



D. Pappus a short crown or none; involucral 



bracts dry, scarious, imbricated; 

 plants typically medium sized. 

 I. Usually with white ray flowers 296. 

 A nthemidaceae. 



