33 8 NATURAL HISTORY BULLETIN. 



8. C. hystricina Muhl. Willd. Sp. PL, iv, 282 (1805) . 



Illus. Flora, 1, 300, fig. 696; Gray's Man., 6th ed., 596; Arthur, Fl. Iowa, 34 ; 

 MacMillan, Metas. Minn. Val., 127; Tracy, Fl. Mo., 93; Higley & Rad- 

 din, Fl. Cook Co., Ills., 131; Bessey, Cont. Fl. Iowa, 124; Bruhin, Fl. 

 Wis., 2S0; Rydberg, Fl. Sand Hills, Neb., 184; Webber, Fl. Neb., y8. 



Margins of streams and ponds; rather common throughout. 

 C. fiseudo-cyfterus L. has been reported from this state, but 

 specimens which I have seen so labelled I consider forms of 

 the above- 

 Charles City, June, 1875, Arthur; Estherville, 1882, and 

 Spirit Lake, July 29, 1896, Cratty; Johnson county, 1887, 

 Hitchcock, and 1894, Shimek; Spirit Lake, July 24, 1883, 

 Arthur; Grinnell, June, 1885, JVorris, and 1886, Johnson; 

 Scott and Muscatine counties, Barnes & Miller; Granite, June, 

 1897, Shimek. 



9. C. comosa Boott. Linn. Trans., xx, 117 (1846). 



C.pseudo-cyperus var. comosa Boott, Bot. Cal. II, 252 (1880). 

 C. pseudo-cyper us var. americana Hochst., Herb. Unio. Itin. (1837). 

 Illus. Flora, 1, 301, fig. 698; Gray's Man!, 6th ed., 596; Arthur, Cont. Fl. 

 Iowa, v; MacMillan, Metas. Minn. Val., 126; Brendel, Fl. Peoriana, 

 63; Bruhin, Fl. Wis., 280; Bot. Surv. Neb., in, 16. 



Central and northern portions of the state; sloughs and 

 margins of ponds. The large, nodding, comose spikes render 

 this a very conspicuous plant. 



Emmet county, 1891, Cratty; Cedar Rapids, Hitchcock; 

 borders of lagoons along Cedar River, Muscatine county, 

 Barnes & Miller. 



10. C. squarrosa L. Sp. PL, n, 973 (i753)- 



Illus. Flora, 301, fig. 700; Gray's Man., 6th ed., 596; Arthur, Cont. Fl. Iowa, 

 III; MacMillan, Metas. Minn. Val., 126; Tracy, Fl. Mo., 94; Brendel, 

 Fl. Peoriana, 63; Bruhin, Zwei. Nach. Fl. Wis., 643; Webber, App. Fl. 

 Neb., 23. 



Rare in swamps; differs from the following species, which 

 has generally been considered a synonym, in its lighter green 

 color, narrower leaves, rarely more than 2 lines wide, and 

 linear-oblong akene. Widely distributed throughout the 

 Misssissippi valley. 



