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. G. 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. FI. Ia. 1: 20; Bessey, Contr. FI. la. 
109; Hitchcock, Cat. Anth. and Pterid. Ames. 505; Fink, 
Sperm. FI. Fayette. Ia. 94; Fitzpatrick, FI. So. Ia. 152; 
Man of FI. PI. Ia. 95; Nagel and Haupt. Phaen. of Daven- 
port. 159; Pammel, Weed Pests. Ia. Agrl. Exp. Sta. 18: 73; — 
Weeds' of Cornfields. 44, 2 /.; Barnes, Reppert, and Mil- 
ler, FI. Scott and Muscatine Counties. 234; Halsted, Prel. 
List of Ia. Weeds. 42. 
CNICUS MUTICUS, Pursh. 
Cnicus muticus Pursh. FI. Am. Sept. 506. 1814. 
Ell. Sk. 2; 268. 1824. 
Gray. Proc. Am. Acad. 10: 89. 1874. 
Gray. Syn. FI. N. Am. 1: 405. 1884. 
Watson & Coulter. Gray’s Man. 296. 1890. 
6 Ed. 
Cnicus glutinosus, Bigel. FI. Bost. 291. 1824. 2 Ed. 
Cirsium muticum, Michx. FI. Bor. Am. 2: 89. 1803. 
DeCandolle. Prodr. 6: 652. 1837. 
Torrey and Gray. FI. 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. FI. N. St. 3: 489. 
f. 4070 1898. 
