COMPOSITAE 629 



Conn. Throughout the area. 



N. Y. L. I. and S. I., increasing northward. 



N. J. Reported, probably as an adventive, from the pine-barrens, 



unknown thence to, but increasing in Essex, Morris, Passaic and 



Sussex counties. 

 Pa. Northampton and Bucks counties. 



Tertiary, o: Cretaceous, o: Older Formations, increasing but not 

 common northward. 1 18-172 days. Sea level-4,020 ft. 



9. B. bipinnata L. In various situations, often as a weed: R. I. 

 to Fla., west to Ohio, Neb. and Ariz. Also in Mex. and 

 tropical Am. 



Locally abundant as a weed except on L. I., there rare or 

 occasional. 



10. B. trichosperma (Michx.) Britton (B. trichosperma tenuiloba 



(A. Gray) Britton). In swamps and wet meadows: Mass.. 



to Ga., 111. and Ky. 



Conn. New Haven. 



N. Y. L. I. and S. I. 



N. J. Common on the coastal plain, locally north of it. 



Pa. Bucks, Philadelphia, Delaware, and Chester counties. 



11. B. aristosa (Michx.) Britton. In swamps and wet places: 



Ohio to Minn., south to La. and Mo.: southeastern Pa. and 

 Delaware. 



Known only only from Delaware Co., Pa. 



12. B. involucrata (Nutt.) Britton. In swamps: 111. to Kan., Ark. 



and Tex. : southeastern Pa. and Del. 

 Known only from Delaware Co., Pa. 



13. B. Beckii Torrey. In ponds and streams: Que. to N. J., west 



to Man. and Mo. 



Conn. Rare in the southern tier of counties, perhaps wanting 



elsewhere. 

 N. J. Known only from Swartzwood Lake, Sussex Co. 



A rare and local species whose distribution is little understood. 



Among the waifs and occasional adventives are Bidens leucantha Willd., and B. 

 tripartita L. They have been collected from some part of our area but probably neither 

 are established. 



