320 



NATURAL HISTORY BULLETIN. 



Margins of streams; well distributed throughout the state, 

 but not common. 



Woodbury county and Sioux City, 1888, Hitchcock; 

 Oquawka. Ills., Patterson: Banks of Wapsipinicon, Scott 

 county, July, 1896, and Fol'etts, Clinton county, Barnes & 

 Miller ; Plymouth county. Arthur, 1. c; Montrose, 1883, Eh- 

 inger ; Jefferson county, 1897, No. 455, Baldzvin. 



6. C. esculentus Z. Sp. PL, 45 ( 1 753) . PI. X- 



Illus. Flora, 1, 241, fig. 559; Gray's Man., 6th ed., 571; Arthur, Fl. Iowa, 

 33; Hitchcock, PI. Ames, 523; MacMillan, Metas. Minn. Val., 92; 

 Tracy, Fl. Mo., 91; Brendel, Fl. Peoriana, 61; Hale, Add. Fl. Wis., 5; 

 Webber, Fl. Neb., 99; Fink, Iowa Acad. Sci., iv, 105. 



Central, eastern and southern portions of the state. The 

 narrow, many flowered spikelets are straw-colored when 

 mature, the leaves a lighter green than those of C. strigosus 

 or C. specsiosus. Propagated by its small, edible tubers which 

 make it occasionally troublesome in low, cultivated fields. 



Charles City, July, 1875, Arthur ; Iowa City and Ames, 

 1889. Hitchcock; Marshalltown, 1891, Stewart; Fayette 

 county, 1893, Fink ; Clinton county, 1896, Pammel; Clayton 

 county, June, 1895, Fitzfatrick ; Scott and Muscatine counties, 

 where it is rather frequent in cultivated fields, Barnes & 

 Miller; Peru, June 20, 1897. No. 452, Hollingsworth; Lib- 

 ertyville, 1897, Baldwin; Mt. Pleasant, Oct. 1, 1897, Dr. Mitte. 



7. C. erythrorhizos Muhl. Gram., 20 (1817). PI. 1. 



Illus. Flora, i. 241, fig. 560; Gray's Man., 6th ed., 571; Hitchcock, PI. 

 Ames, 523; MacMillan, Metas. Minn. Val., 92; Tracy, Fl. Mo., 91; 

 Brendel, Fl. Peoriana, 61; Bruhin, Fl. Wis., 278; Williams, Grass, and 

 For. PI. Dakotas, 41. 



Probably throughout the state; banks of streams and mar- 

 gins of lakes. Not before reported from Iowa. The linear 

 spikelets of many very small flowers with their bright, chest- 

 nut-colored scales are very pretty objects under the lens. 



Estherville, bank of Des Moines River, 1881, Cratty ; Story 

 county and Iowa City, Hitchcock; Clinton county, 1896, Pam- 

 mel; Scott and Muscatine counties, Barnes & Miller ; Iowa 

 Lake, 1897, Pammel & Cratty. 



