596 



COMPOSITAE 



Rays mostly more numerous than the disk-flowers. 

 Ray-flowers not yellow in any of our species. 



Pappus a mere crown, or of a few awns or bristles, never of 

 numerous capillary bristles. 

 Receptacle conic. 

 Receptacle flat. 

 Pappus of numerous capillary bristles. 



Pappus of a single series of bristles, sometimes the outer 

 shorter. 

 Bracts of the involucre in 2 to many series. 



Involucre narrow, its bracts firm; rays few, 



white. 

 Involucre turbinate to hemispheric; bracts 

 mostly thin; rays usually numerous. 

 Bracts of the involucre in only I or 2 series, very 

 narrow; heads mostly long-peduncled. 

 Rays longer than the diameter of the disk. 

 Rays shorter than the diameter of the disk. 

 Pappus distinctly double, the inner series long, the outer 

 shorter. 

 Leaves lanceolate, ovate or obovate; rays white. 

 Leaves narrowly linear; rays violet. 

 Ray-flowers none; dioecous shrub; pappus capillary. 



II. EUTHAMIA. 



12. Bellis. 



13. boltonia. 



14. Sericocarpus. 



15. Aster. 



16. Erigeron. 



17. Leptilon. 



18. Doellingeria. 



19. ionactis. 



20. Baccharis. 



8. Grindelia Willd. 



1. G. squarrosa (Pursh) Dunal. In dry soil: 111. and Minn, to 



Man., south to Mo., Tex., Nev. and Mex. Adventive in 

 southern N. J. and in Conn. 



Rare as an adventive in New Jersey and Conn.,' perhaps not 

 persistent. 



G. glutinosa Dun. has been collected as a waif. 



9. Chrysopsis Nutt. 



Leaves elongated-linear, parallel-veined. 1 . C. falcata. 



Leaves oblong or lanceolate; plan!: hirsute-villous-pubescent. 2. C. mariana. 



i. C. falcata (Pursh) Ell. In dry soil: eastern Mass. to N. J. 

 Conn. Common along the coast, rare or wanting inland. 

 N. Y. Local on L. I., rare on S. I.; not recorded elsewhere. 

 N. J. The pine-barrens, there rare or local. 



Tertiary, confined to Beacon Hill: Cretaceous, o: Older Forma- 

 tions, scattered in sandy places. 189-220 days. About sea level. 



2. C. mariana (L.) Ell. In dry soil: southern N. Y. and Pa. 



to Fla. and La. 



N. Y. Common on L. I. and S. I., unknown elsewhere. 



