598 MINNESOTA BOTANICAL STUDIES. 



Gaillardia aristata PURSH, Fl. Am. Sept. 573. 1814. 



Coll. : MacMillan & Skinner 380, Holmes. 

 No previous authentic collections from Minnesota in the Her- 

 barium of the University. 



Achillas millefolium L. Sp. PI. 899. 1753. 



Coll.: Ballard 2624, St. Vincent; MacMillan & Skinner 

 45, Crookston. 



Artemisia caudata MICHX. Fl. Bor. Am. 2: 129. 1803. 

 Coll. : MacMillan & Skinner 73, Crookston. 



Artemisia dracunculoides PURSH, Fl. Am. Sept. 742. 1814. 

 Coll. : MacMillan & Skinner 65, Crookston. 



Artemisia frigida WILLD. Sp. PL 3: 1838. 1804. 



Coll. : MacMillan & Skinner 74, Crookston ; Ballard 

 2597, Humboldt. 



Artemisia absinthium L. Sp. PL 848. 1753. 

 Coll. : Ballard 2553, St. Vincent. 



Artemisia biennis WILLD. Phytogr. n. 1794. 

 Coll. : Ballard 2726, Kennedy. 



Artemisia gnaphalodes NUTT. Gen. 2 : 143. 1818. 



Coll.: Ballard 2619, Humboldt; 2698, Northcote ; 2732, 

 Kennedy; 2798, Warren; MacMillan & Skinner 55, 

 Crookston. 



Arctium lappa L. Sp. PL 816. 1753. 



Coll. : MacMillan & Skinner 210, Crookston. 



Carduus altissimus L. Sp. PL 824. 1753. 



Coll. : Ballard 2501, Fergus Falls; MacMillan & Skinner 

 170, Maple lake. 



Carduus discolor (MUHL.) NUTT. Gen. 2: 130. 1818. 

 Coll. : MacMillan & Skinner 12, Crookston. 



Carduus undulatus NUTT. Gen. 2 : 130. 1818. 

 Coll. : MacMillan & Skinner 48, Crookston. 



Carduus arvensis (L.) ROBS. Brit. FL 163. 1777. 



Coll.: Ballard 2548, St. Vincent ; MacMillan & Skinner 

 283, Thief River Falls. 



