FLORA OF THE MIAMI VALLEY. 27 



CENTAUREA, L. 

 C. Cyanus, L. Bluebottle. 



CIRSIUM, TouRN. 

 C. lanceolatum, Scop. Common Thistle. 

 C. discolor, Spreng. 

 C. altissimum, Spreng. 

 C. muticum, Michx. Swamp Thistle. 



ONOPORDON, Vaill. 

 O. acanthium, L. Scotch Thistle. 



LAPPA, TouRN. 

 L. officinalis, All. Burdock. 



HIERACIUM, TouRN. ~ 

 H. venosum, L. Rattlesnake Weed. 



NABALUS, Cass. 

 N. albus, Hook. 

 N. racemosus, Hook. 



TARAXACUM, Haller. 

 T. Dens-leonis, Desf. Dandelion. 



LACTUCA, TouRN. 

 L. Canadensis, L. Wild Lettuce. 



MULGEDIUM, Cass. 

 M. acuminatum, DC. Blue Lettuce. 

 M. Floridanum, DC. 

 M. leucophaeum, DC. 



SONCHUS, L. 

 S. oleraceus, L. Cominon Sow Thistle. 

 S. asper, Vill. Spiny-leaved Sow Thistle. 



