IOWA ACADEMY OF SCIENCES. 227 



cious, in staminate plant flowers exserted with abortive pistils, in 

 pistillate less so, scarcely exceeding the bracts stamens with abortive 

 anthers, tubes of the corolla six lines long, anther tips acute, fila- 

 ments minutely pubescent, young achenium pubescent, all of the 

 bristles of the pappus plumose. 



Distribution, Iowa. — Houston County, Minnesota, Minne- 

 sota and Iowa line, L. H. Pammel, No. 581, I. S. C. Bed- 

 ford, A. Ct. Lucas. Ames, E. R. Hodson. Lawler, P. H. 

 Rolfs. Near Tama City, C. E. Arnold. Decatur and John- 

 son Counties, T. J. and M. F. L. Fitzpatrick. Johnson 

 County, Emma G. Linder. Moscow and Muscatine, Ferd. 

 Reppert. Keokuk, Lee county; Cedar Rapids, Linn County, 

 and Johnson county, Shimek. 



REFERENCES TO OCCURRENCE IN THE STATE. 



Arthur, Contr. Fl. la. 1: 20; Bessey, Contr. Fl. la. 

 109; Hitchcock, Cat. Anth. and Pterid. Ames. 505; Fink, 

 Sperm. Fl. Fayette. la. 94; Fitzpatrick, Fl. So. la. 152; 

 Man of Fl. PI. la. 95; Nagel and Haupt. Phaen. of Daven- 

 port. 159; Pammel, Weed Pests. la. Agrl. Exp. Sta. 13: 73;— 

 Weeds of Cornfields. 44, 2 f.\ Barnes, Reppert, and Mil- 

 ler, Fl. Scott and Muscatine Counties. 234; Halsted, Prel. 

 List of la. Weeds. 42. 



CNICUS MUTICUS, Pursh. 



Cnicus muticus Pursh. Fl. Am. Sept. 506. 1814. 



Ell. Sk. 2: 268. 1824. 



Gray. Proc. Am. Acad. 10: B9. 1874. 



Gray. Syn. Fl. N. Am. 1: 405. 1884. 



Watson & Coulter. Gray's Man. 296. 1890. 



6 Ed. 

 Cnicus glutinosus, Bigel. Fl. Bost. 291. 1824. 2 Ed. 

 Cirsium muticum, Michx. Fl. Bor. Am. 2: 89. 1803. 



DeCandolle. Prodr. 6: 652. 1837. 



Torrey and Gray. Fl. N. Am. 2: 458. 1843. 



Gray. Man. 1868. 274. 5 Ed. 



Cirsium bigelovii, D.C. Prodr. 6: 652. 1837. 



Carduus muticus, Pers. Syn. 2: 386. 1807. 



Britton & Brown. Illust. Fl. N. St. 3: 489. 



/. 4010 1898. 



