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 mtiticus Pursh. Swamps, 

 low land. Frequent. Th. 



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

 Macomb Co., Dr. Coolej'j Baldwin, W. J. B.; Cheboygan Co., B. & K. 



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

 of the Great Lakes; sand dunes. 



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

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



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

 of Lakes Huron and Michigan, A. Gray; Drummond's I., 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, 0. 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. Skeels. Introduced from Europe as a plant for bees. 



