598 MINNESOTA BOTANICAL STUDIES. 
Gaillardia aristata Pursu, Fl. Am. Sept. 573. 1814. 
Coll.: MacMillan & Skinner 380, Holmes. 
No previous authentic collections from Minnesota in the Her- 
barium of the University. 
Achillea millefolium L. Sp. Pl. 899. 1753. 
Coll.: Ballard 2624, St. Vincent; MacMillan & Skinner 
45, Crookston. 
Artemisia caudata Micux. Fl. Bor. Am. 2: 129. 1803. 
Coll.: MacMillan & Skinner 73, Crookston. 
Artemisia dracunculoides Pursn, Fl. Am. Sept. 742. 1814. 
Coll.: MacMillan & Skinner 65, Crookston. 
Artemisia frigida Wi1LLp. Sp. Pl. 3: 1838. 1804. 
Coll.: MacMillan & Skinner 74, Crookston; Ballard 
2597, Humboldt. 
Artemisia absinthium L. Sp. Pl. 848. 1753. 
Colli: Ballard 2553, St. Vincent. 
Artemisia biennis WiLLp. Phytogr. 11. 1794. 
Coll.: Ballard 2726, Kennedy. 
Artemisia gnaphalodes Nutr. 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 (Munvu.) Nutr. Gen. 2: 130. 1818. 
Coll.: MacMillan & Skinner 12, Crookston. 
Carduus undulatus Nutt. Gen. 2: 130. 1818. 
Coll.: MacMillan & Skinner 48, Crookston. 
Carduus arvensis (L.) Ross. Brit. Fl. 163. 1777. 
Coll.: Ballard 2548, St. Vincent; MacMillan & Skinner 
283, Thief River Falls. 
