3S1] FLORA OF COLUMBIA AND VICINITY 239 



1029. S. aureus L. Golden squaw-weed. 

 Common on moist banks and shaded cliffs. 

 Newfoundland to Ontario, Michigan and Missouri; 



Florida to Texas and Colorado. 



1030. S. obovatus Muhl. Round-leaf squaw-weed. 

 Common on moist banks along Grindstone creek. 



Nova Scotia to Ontario and Michigan; Florida to Mis- 

 souri. 



103 1. S. lobatus Pers. Butterweed. 

 Moist flats of the Missouri near Rocheport. 



North Carolina to Illinois and Missouri; Florida to 

 Texas and Mexico. 



423. ARCTIUM L. Burdock. 



1032. A. minus Schk. Common burdock. 

 Common in waste places. 



Europe and Asia, thence to North America. 



424. OIRSIUM Scop. [CARDUUSL.: CNICUS 

 L.]. Thistle. 



1033. O. lanceolatum (L.) Scop. \_Cardu21s lanceolatus L.: 

 Cnicus lanceolatus (L.) Willd.]. Bull thistle. 



Common in fields and waste places. 



Europe, North Asia and North Africa: naturalized in 

 North America and New Zealand. 



1034. C. altissimum (L.) Spreng. [Cardmis altissimus 'L.: 

 Ciiiciis aliissimus (L.) Willd.]. Tall thistle. 



Common in fields and thickets. 



Massachusetts to South Dakota; Florida to Texas. 



1035. O. discolor (Muhl.) Spreng. [Cardmis discolor 

 (Muhl.) Nutt.: Cmcns aliissimus discolor {Muh\.) Gray']. 

 Field thistle. 



Common in fields and thickets. 



Quebec to South Dakota; Georgia to Missouri and Ne- 

 braska. 



