1002 



COMPOSITAE 



Cirsium 



50 



Map 2196 



Cirsium arvense (L.) Scop. 



Map 2198 



Cirsium muticum Michx. 



4. Cirsium Hillii (Canby) Fern. (See Hill. Rhodora 12: 211-214. 1910.) 



Map 2197. This thistle prefers dry, sandy or gravelly soil and all of our 

 records are from within the area shown on the map. My specimens from 

 Benton, Fulton, and White Counties are from the right-of-way of rail- 

 roads. The others are from open dunes, open woodland, and the high bank 

 of a stream. 



Ont. to Man., southw. to Pa. and Iowa. 



5. Cirsium muticum Michx. Swamp Thistle. Map 2198. This species 

 is found in boggy places, marshes, and swamps, often in marly soils. It 

 is infrequent in the lake area, becoming rare or absent southward. 



Newf. to Sask., southw. to Fla. and Tex. 



6. Cirsium virginianum (L.) Michx. Virginia Thistle. Map 2199. 

 I have found this species only on wooded slopes. It is rare, and Phinney's 

 report for it from the area of Delaware, Jay, Randolph, and Wayne Coun- 

 ties I refer to some other species. This is a southern plant, and Phinney 

 did not report all of the species that are common in his area. 



Va., Ohio, and Ind., southw. to Fla. and Tex. 



7. Cirsium discolor (Muhl.) Spreng. Field Thistle. Map 2200. In- 

 frequent to frequent throughout the lake area, becoming rare southward 

 and very local, if found at all, in the hill country. It prefers a moist soil 

 rich in humus and is often a common plant in mucky soil that has recently 

 been drained. It is found in its habitat along roadsides and streams 

 and in marshes and swamps. 



N. B. to S. Dak., southw. to Ga., Mo., and Nebr. 



8. ' Cirsium altissimum (L.) Spreng. Tall Thistle. Map 2201. This 

 species is infrequent to rare throughout the state. It is more frequent in 

 southern Indiana and is most common on wooded slopes along streams. 

 This is really a woodland and dry soil species, but it is also found in the 

 open and even in springy places. 



Mass. to Minn., southw. to Fla. and Tex. 



