THE IOWA SEDGES 357 



Dry ground, common except in the northern portions 

 of the state; a very pretty species, the plant a pale green, 

 especially the small spikes. 



Ames, June, 1875, Arthur ; Johnson county, 1894, several 

 collections, Shimek; Fayette county, 1895, Skinner ; Story 

 county, Hitchcock ; Muscatine, 1890, Reppert ; Scott and Mus- 

 catine counties, Barnes & Miller; Louisa county, Aug. 1, 

 1897, Shimek & Meyers. 



60 C. leavenworthii Dew. Am. Jour. Sci., 2nd ser., 11, 

 246 (1846). 



C. cephalopliora var. augustifolia Boott. III. Car. 123 (1862). 

 Illus. Flora, 1, 349, fig. 842; Gray's Man., 6th ed., 617. 



Probablv rare in the southwestern portion of the state. Not 

 before reported from Iowa. This much resembles the pre- 

 ceding species, from which it is distinguished by its smaller 

 size, very slender culms, and much narrower leaves, l / 2 to i 1 /^ 

 lines wide. The heads and perigynia are smaller than those 

 of C. cephalophora. So far as is known to the author, this 

 species does not occur east of the Mississippi river. The 

 range heretofore given is from Missouri and Arkansas to 

 Texas. 



Shelby county, May 11, 1895, Fitzpatrick. My thanks are 

 due Prof. Bailey for verifying my determination of this plant. 



61. C. sterilis Willd. Sp. PI. iv, 208 (1805). 



C. sterilis var. excelsior Bailey. Bull. Torr. Club, xx, 425 (1893). 

 Illus. Flora. 1, 350, fig. 844; Gray's Man. 6th ed., 618; Arthur, Fl. Iowa, 

 33; Tracy, Fl. Mo., 95; Brendel, Fl. Peoriana, 62. 



Moist soil, eastern portion of the state, rare. 



Railroad track near Buffalo, Scott county, 1895, Barnes & 

 Miller. This plant, the spikes large and approximate, differs 

 from the type in having the perigynia much broader, 1 line 

 long by 2 /3 line wide, and rounded or sometimes slightly cord- 

 ate at the base. Prof. Bailey, who refers it to his var. excel- 

 sior, savs, "very like C. atlanlica." A similar form, but 

 greener and 2 feet tall, was collected at Keokuk June 1, 1897, 

 by Prof. Shimek, who also collected the typical form at High 



