70 Annals of ihk Carnegie Museum. 



MESADENIA Rafmesque. 

 CACALIA LinncEus. 



* M. reniformis (Muhlenberg). Great Indian plantain. 



* M. atriplicifolia (Linnajus). Pale Indian plantain. 



ERECHTITES Rafinesque. 



* E. hieracifolia (Linnaeus). Fireweed. 



ARCTIUM Linnaeus. 

 f A. Lappa Linnteus. Great burdock. 



* A. minus Schkuhr. Common burdock. 



CARDUUS Linnaeus. 



CNICUS Tournefort. 



* C. lanceolatus Linnaeus. Common thistle. 



* C. altissimus Linntiius. Roadside thistle. 



* C. discolor (Muhlenberg). Field thistle. 



* C. odoratus (Muhlenberg). Pasture thistle. 



Fawn Township, roadside, Josiah Painter's place, July, 1895. 



^= C. muticus (Michaux). Swamp thistle. 



Hampton Township, north of Wildwood Station, July, 1887, Dr. 

 Adolph Koenig ; August, 1890, J. A. S. 



* C. arvensis (Linnseus). Canada thistle. 



ONOPORDON Linneeus. 



* 0. Acanthium Linnaius. Cotton thistle. 



Pittsburg, W. Carson St., near city lines, July, 1889-98. 



