136 MICHIGAN ACADEMY OF SCIENCE. 



*2233. C. lanceolatus L. Common or Bull Thistle. Roadsides and fields. Common. 

 Th. 



*2234. C. muticus (Mich.) Pers. Swamp Thistle. Cnicus muticus Pursh. Swamps, 

 low land. Frequent. Th. 



2235. C. odoratus (Muhl.) Porter. C. pumilus Nutt. S. W. Mich., Wright's Cat.; 

 Macomb Co., Dr. Cooley; Baldwin, W. J. B.; Cheboygan Co., B. & K. 



2236. C. Pitcheri (Torr.) Porter. Pitchers Thistle. Cnicus Pitcher I Torr. Shores 

 of the Great Lakes; sand dunes. 



2237. C. spinosissimus Walt. Yellow Thistle. Cnicus Jiorridus Pursh. N. shore 

 Lake Superior, Agassiz; Grand Detour, T. C. Porter. 



2238. C. undulatus Nult. Wavy-leaved Thistle. Cnicus undulatus A. Gray. Islands 

 of Lakes Huron and Michigan, A. Gray; Drummond's L, Winch. Cat. N. & U. P. 



MARIANA Hill. SILYBUM Gaertn. 



*2239. M. Mariana (L.) Hill. Milk Thistle. Silybum Marianum Gaertn. Occasional. 



ONOPORDON L. 



2240. 0. Acanthium L. Cotton or Scotch Thistle. Grand Rapids; Detroit, O. A. 

 Farwell. Rare. 



CENTAUREA L. 



2241. C. Cyanus L. Blue-bottle. Escaped from gardens. 



2242. C. nigra L. Black Knapweed. Centaury. / Bay City, G. M. Bradford. 



ECHINOPSIS. 



2243. E. sphaerocephalus L. Well established at Three Rivers, C. F. Wheeler. 

 Grand Rapids, H. C. S keels. Introduced from Europe as a plant for bees. 



