Shaker: Vascular Fr.oRA of Allegheny County. 71 



CENTAUREA Linn?eus. 



* C. Cyanus Linnaeus. Corn-flower. 



Harrison and Moon Townships ; escaped from gardens. 



AMBROSIACE^ Reichenbach. 



RAGWEED FAMILY. V-42. 



AMBROSIA Linnteus. 



* A. trifida Linnaeus. Great ragweed. 



* A. trifida integrifolia (Muhlenberg). Entire-leaved great ragweed. 



* A. artemisiaefolia Linnitus. Ragweed. 



XANTHIUM Linnsus. 



* X. strumarium Linnaeus. Burweed. 



CICHORIACE^ Reichenbach. 



CHICORY FAMILY. V-41. 



ADOPOGON Necker. 



KRIGIA Schreber. 



* A. Virginicum (Linnaeus). Virginia goatsbeard. 

 K. ampIexicauHs Nuttall. 



CICHORIUM Linnaeus. 



* C. Intybus Linnaeus. Chicory. 



HIERACIUM Linnaeus, 

 f H. Canadense Michaux. Canada hawkweed. 



* H. paniculatum Linnaeus. Panicled hawkweed. 



* H. venosum Linn^us. Rattlesnake-weed. 



