•326 NATURAL HISTORY BULLETIN. 



6. E. wolfii (A. Gray) Britton. Jour. N. Y. Micros. Soc. 



v, 105 (1889.) 



Scirpus ivolfii Gray. Proc. Am. Acad., x, 77 (1874). 

 Illus. Flora, 1. 252, fig, 588; Gray's Man., 6th ed., 576; Arthur, Cont. Fl. 

 Iowa, vi; MacMillan, Metas. Minn. Val., 99; Brendel, Fl. Peoriana, 61. 



Low ground on prairies, the culms much compressed, light 

 colored and weak. A rare species, also occurring locally in 

 Illinois and southern Minnesota. 



Emmet county, 1886, Cratty ; Iowa City, Hitchcock. 



7. E. tenuis ( Willd.) Schultes. 



Scirpus tenuis Willd, Enum., 1, 76 (1809). 

 Illus. Flora, 1, 255, fig. 595; Gray's Man., 6th ed., 575; MacMillan, Metas. 

 Minn. Val., 100; Tracy, Fl. Mo., 91 ; Brendel, Fl. Peoriana, 62: Wheeler, 

 Fl. Milwaukee Co., Wis., 186. 



Probably rare within our limits; not before reported from 

 Iowa. Its perennial habit at once distinguishes the growing 

 plant from E. intermedia (Muhl.) Schultes, with which the 

 dried plant is apt to be confounded when not in mature fruit. 



Iowa City, Hitchcock ; Grinnell, May, 1886, JVorris; Deca- 

 tur county, May 24, 1897, probably this, the fruit not matured, 

 Fitzpatrick. 



8. E. acuminata (Afuht.) JVees. Linna^a, ix, 294 (1835). 



E. compressa Sulliv. Sill. Jour., xlii, 50 (1842). 

 Illus. Flora, 1,255, fig- 595; Gray's Man., 6th ed., 576; Arthur, Fl. Iowa, 33; 

 MacMillan, Metas. Minn. Val., 101 ; Tracy, Fl. Mo., 91; Brendel, Fl. 

 Peoriana, 61; Wheeler, Fl. Milwaukee Co., Wis., 186; Rydberg, Fl. Bl. 

 Hills, S. D.,527. 



Low ground, southern and eastern portions of the state. 

 Probably not very common within our limits. 



Iowa City, Hitchcock ; Grinnell, June, 1894, yohnson; Scott 

 and Muscatine counties, Barnes d~ Miller ; Hancock county, 

 188 1, E liinger ; Ames, July, 1875, Arthur; Peru, July, 1897, 

 No. 395, Hollingsworth. 



9. E. intermedia (Mu/il.) Schultes. Mant., n, 91 (1824). 



Illus. Flora, i, 255, fig. 597; Gray's Man., 6th ed., 575; Arthur, Fl. Iowa, 33; 

 MacMillan, Metas. Minn. Val., 100; Tracy, Fl. Mo., 91; Brendel, Fl. 

 Peoriana, 61; Bruhin, Fl. Wis., 278. 



