374 THE PLANT PHYLA 



culminating on the one hand in the 

 Eupatoriaceae, and on the other in the 

 Lactucaceae. 



Key to the Families of Asterales 



A. Pappus not capillary; plants typically large 



and coarse. 

 L Receptacle chaffy. 



1. Usually with ray flowers — 287. Heli- 

 anthaceae. 



2. Without ray flowers — 288. Ambros- 

 iaceae. 



IL Receptacle naked (rarely chaffy). 



1. Anthers tailless. 



a. Involucral bracts mostly in 2 



series — 289. Heleniaceae. 



b. Involucral bracts in many 



series — 290. Ardotidaceae. 



2. Anthers tailed or mucronate — 291. 

 Calendulaceae. 



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



tacle usually naked; plants typically 

 low to medium sized. 

 L Usually without ray flowers; anthers 

 tailed — 292. Inulaceae. 



C. Pappus from short bracteose to capillary or 



none; receptacle naked; plants typi- 

 cally medium sized. 



L Usually with ray flowers — 293. Aster- 

 aceae. 



IL 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. 

 Anthettiidaceae. 



