THE IOWA SEDGES. 



131 



Illus. Flora, i, 271, fig. 636; Gray's Man., 6th ed., 5S2 ; Arthur, Fl. Iowa, 33; 

 Hitchcock, PI. Ames, 524: MacMillan, Metas. Minn. Val., 96; Brendel, 

 Fl. Peoriana, SS: Wheeler, Fl. Milwaukee Co., Wis., xS6: Rydberg, Fl. 

 Bl. Hills, S. D., 527; Fink, Iowa Acad. Sci., iv, 105. 



Habitat and range similar to the preceding from which it 

 differs in having the spikelets in capitate clusters. k and the 

 bristles to the mature fruit much longer. A variable plant. 



Iowa City. Hitchcock ; Fayette countv, 1894, Ftnk; Jasper 

 county, Aug., 18S5. ^Johnson; Scott and Muscatine counties, 

 Barnes dc Miller ; Charles City. Arthur. 



ERIOPHORUM L. Sp. PL 52 (1753). 



A small genus of perennial bog sedges restricted to the 

 northern hemisphere. The perfect flowers are disposed in 

 solitary, capitate or umbelled spikes, and are furnished j with a 

 perianth of few or numerous bristles which are much elon- 

 gated in fruit and very conspicuous, whence the popular name, 

 Cotton-Grass. 



Species about 10. 



Illus. Flora, 7: Gray's Man.. 6th ed., 5: Arthur, Fl. Iowa, 2: MacMillan, 

 Metas. Minn. Val., 5: Tracy, Fl. Mo., 1; Brendel, Fl. Peoriana, 2: Web- 

 ber, Fl. Xeb., and Rep. 1— IV, 2. 



i. E. polystachyon L. Sp. PI. 52 | 1 75;, • 



Illus. Flora, 1, 273, fig. 641: Gray's Man., 6th ed., 5S3: Arthur, Cont. Fl. 

 Iowa, in; Hitchcock, PI. Ames, 524: MacMillan, Metas. Minn. Val., 

 95; Bessey, Cont. Fl. Iowa, 123; Brendel, Fl. Peoriana, SS: Wheeler, 

 Fl. Milwaukee Co., Wis., 1S6: Fink, Iowa Acad. Sci., iv, 105. 



Swamps, throughout the northern and eastern portions of 

 the state. Quite variable in regard to width of leaves, size of 

 spikes, and length of bristles. The latter are usually a bright 

 white, but forms were collected by the author in Emmet 

 county with the bristles slightly russet-tinged, and a similar 

 form was collected bv Prof. B. Fink in Fayette county. The 

 color, though similar, is much lighter than that of E. russco- 

 lum Fries. 



iv — \ 2 E 2 



