576 MINNESOTA BOTANICAL STUDIES. 
Carex utriculata Bootr; Hook. Fl. Bor. Am. 2: 221. 1840. 
Coll.: MacMillan and Skinner 139, Maple lake; 381, 
Holmes. 
Carex retrorsa Scuwein. Ann. Lyc. N. Y. 1: 71. 1824. 
Coll.: MacMillan & Skinner 423, Crookston. 
Carex fusca Aux. Fl. Ped. 2:°269.° 1785. 
Coll.: MacMillan & Skinner 133, Maple lake. 
Carex cristatella Britton, in Britton & Brown, Ill. Fl. 1: 357. 
1896. 
Coll.: MacMillan & Skinner 249, Red Lake Falls. 
Carex sychnocephala Carey, Am. Journ. Sci. (Il.) 4:24. 1847. 
Coll.: MacMillan & Skinner 307, Crookston. 
ARACEZ. 
Arisema triphyllum (L.) Torr. Fl. N. Y. 2: 239. 1843. 
Coll.: MacMillan & Skinner 237, Gentilly. 
Calla palustris L. Sp. Pl. 968. 1753. 
Coll.: MacMillan & Skinner 174, Maple lake. 
Acorus calamus L. Sp. Pl. 324. 1753. 
Coll. : MacMillan & Skinner 282, Thief River Falls. 
LEMNACEZ. 
Lemna trisulca L. Sp. Pl. 970. 1753. 
Coll.: Ballard 2654, St. Vincent; MacMillan & Skinner 
410, Holmes. 
Lemna minor L. Sp. Pl. 970. 1753. 
Coll.: Ballard 2546, Fergus Falls. 
JUNCACEZ. 
Juncus balticus WiLvp. Berlin Mag. 3: 298. 1809. 
Coll.: MacMillan & Skinner 136, Maple lake; 4o1, 
Holmes. 
Juncus vaseyi EncExmM. Trans. St. Louis Acad. Sci. 2: 450. 
1866. 
Coll.: MacMillan & Skinner 135, Maple lake. 
Juncus dudleyi Wiecanp, Bull. Torr. Club, 27: 524. 1900. 
Coll.: MacMillan & Skinner 137, Maple lake; 276, 
Wylie. 
