67 



2 Rays yellow. Achenes thick, rounded at apex. Wedelia. 



2 Rays yellow. Achenes truncate or convex at apex. Melanthera. 



2 Rays white. Achenes ciliate. Spilanthes. 



ANTHEMIDEiE. 



Reeeptacle paleaceous. 

 Receptacle nude or honeycombed. 

 Heads discoid. 



Achenes equal or 5-10 ribbed. 

 Achenes 3-5 ribbed on inner 



Involucral bracts in 1-2 series. 

 Involucral bracts many seriate. 



1 Heads radiate. 



2 Heads radiate. 



2 Heads radiate, 

 face. 



2 Heads discoid 



2 Heads discoid 

 3 Peduncles swollen at apex. 

 3 Peduncles not swollen at apex. 



4 Perfects florets i-toothed. Receptacle convex 



4 Perfect florets 5-toothed. Heads racemose. 



4 Perfect florets 5-toothed. Heads corymbose. 

 5 Achenes all 5-10 ribbed. 

 5 Achenes aU 5-ribbed. 



Athanasia. 

 eumorphia. 

 Chrysanthemum. 



Matricaria. 



Cenia. 



COTDLA. 

 SOHISTOSTEPHIUM. 



Artemisia. 



5 

 Gymnopentzia, 

 Pentzia. 



SENECIONIDEiE. 



Involucral bracts herbaceous, free nearly or quite to base. 

 Involucral bracts connate in a cup at base. 



1 Involucral bracts crested and winged. Lophol^na. 



1 Style arms slender, subulate, hispid. Gynura. 



1 Achenes of ray, or all, dorsally compressed. Cm kh aria. 



1 Achenes 5- 10-ribbed, glabrous or villous. Disk 



florets, fertile. Senecio. 



1 Achenes 5-lO-ribbed, glabrous or villous. Disk 



florets, sterile. Othonnopsis. 



2 Styles bifid. Pappus slender. Achenes 10- 

 ribbed. EURYOPS. 

 2 Styles bifid Pappus none. Achenes 5-10-ribbed. Gamolepis. 

 2 Styles entire. Pappus copious. Achenes oval, 



in disk florets abortive. Othonna. 



CALENDULACE^. 



Achenes of ray 3-angled, of disk compressed, 2- 



wmged. 



Achenes polymorphous often in same head. 



annual. 

 Achenes of ray 3-angled, of disk barren. 

 Achenes of ray nut-like, hard, glabrous. 



Small 



DiMORPHOTHECA. 



Oligooarpus. 

 Tkiptkris. 



OsTEOSPERMUM. 



