88 TWELFTH ANNUAL REPORT. 



C^N'ICUS, Tourn. (Included in Cirsidm by MianwaZ.) Thistle. 



C. lanceolatas, Hoffm. Common Thistle. 



Frequent, but seldom plentiful, throughout the state. North of lake Superior, 

 Juni; Pembina, Havard; Minneapolis, Griswold, Kassuhe; lake Pepin, Miss Manning; 

 Wabasha, Gihson; Nicollet county, Aiton; Blue Earth county and southward (common), 

 Leiberg. 



C. Pitclieri, Torr. Pitcher's Thistle. 



North shore of lake Superior, Macoun; doubtless In Minnesota. 



C. uuclulatus, Gray. Thistle. 



North of lake Superior (in a grass field at Grand Marais, said to have made its first 

 appearance in 1878), Roberts. LNear Fort Pierre, Dakota, Geyer.] Plains, &c., from 

 lake Huron and Minnesota to Saskatchewan, west to Oregon, south to Kansas and 



New Mexico. Gray's Synoptical Flora of N. A . 



C. uuclulatus, Gray, var. canescens, Gray. Thistle. 



Merely a form with smaller heads, sometimes not over an inch long, the leaves 

 varying from ciliately spinulose-dentate to deeply pinnatifid.— Minnesota to New 

 Mexico and southern Utah. Gray's Synoptical Flora of N. A. 



C. vmclulatus, Gray, var. niegaceplialus. Gray. Thistle. 



stouter form, usually broader-leaved, with broad heads 2 inches or more long.— 

 Minnesota and Texas to Idaho. Gray's Synoptical Flora of N. A. 



C. altissimus, Willd. Tall Thistle. 



Lake Pepin, Miss Manning; Minneapolis, Simmons; Faribault, Miss Beane; Blue 

 Earth county, Leiberg; abundant in Martin county, and in Emmet county, Iowa, Cratty; 

 common northwestward and in the Red river valley, Upham, Scott. South and west- 



O. altissimus, Willd., var. discolor, Gray. (C. discolor, Muhl.) Thistle. 



Minneapolis, Kassube, Roberts, Simmons; Hesper, Iowa (common), Mrs. Carter; 



Worthington (common), Foote; Redwood Falls, Pemberton; Anoka county, Juni; 



Stearns county. Garrison; Clay county, Upham; Pembina, Havard. South and west. 



C. niuticus, Pursh. Swamp Thistle. 

 Common, or frequent, throughout the state. 



C pumilus, Torr. Pasture Thistle. 



Goodhue county, Sandberg; Dakota county (frequent), Uphani', Anoka county, 

 Juni; Stearns county. Garrison; Alexandria, Douglas county, Mrs. Terry. South. 



C, arvensis, HofFm. Canada Thistle. 



Newburgh, Fillmore county, Mrs. Carter; covering about an acre close west of 

 Rochester, Olmsted county ; a few miles east of Faribault ; Stillwater, Miss Field; on 

 Western avenue, at the west border of Minneapolis, spreading, Roberts. Rare, but 

 likely to become common ; in many districts farther east, "a most troublesome weed, 

 extremely difficult to eradicate." 



ONOPORDON, Vaill. Cotton Thistle. Scotch Thistle. 



0. acanthium, L Cotton Thistle. Scotch Thistle. 



Lake City, Mrs. Ray. Rare. 



ARCTIUM, L. (Lappa, Tourn.) Burdock. 



A. Lappa, L. [L. officinalis, Allioni, var. major, Gray.) Common Burdock. 



Common through the south half of the state, and probably northeastward; less fre- 

 quent in the Red river valley. 



