IOWA ACADEMY OF SCIKNCES. 229 



lower bracts ovate with a broad base and a weak pricklj recurved 

 bristle, slight dorsal gland, inner linear lanceolate with a nearly 

 colorless entire appendage; flowers purple, tube of the corolla 

 nearly eleven to twelve lines long, lobes of the corolla terminating 

 in clavate tips, anther tips acme, filaments pubescent; bristles of 

 pappus plumose; achenium twenty-two lines long, smooth, upper 

 part yellow. 



The species is certainly fairly constant and may usually 

 be readily separated from typical C. altissimus and C. 

 lotvensis. In the character of its head it approaches C. 

 loumisis, but the more numerous segments of the smaller 

 leaves separates it from that species. It is certainly 

 markedly different from C. altissimus. Frequent along 

 roadsides and in timber. 



Distribution . — Ames, Pammel & Combs. No. 68; Fred 

 Rolfs. Keokuk, P. H. Rolfs. Johnson County, Oct., 1893, 

 T. J. & M. F. L. Fitzpatrick. Muscatine, Iowa, Ferd. Rep- 

 pert. Winnebago County, B. Shimek, S. U. I. Skunk 

 River Valley, Lee County, Paul Bartsch. Muscatine 

 County, Reppert, 435. 



Mr. Reppert reports a w^hite-flowered form along the 

 Cedar river. 



REFERENCES TO OCCURRENCE IN IOWA. 



Arthur, Contr. Fl. la. 1: 20; Barnes, Reppert, and Miller, 

 Fl. Scott and Muscatine Cos. 234. Hitchcock Cat. Anth. 

 and Pterid. Ames, 505. Pammel Notes on the Fl. West 

 la. 125. Weeds of Cornfields. 39: 42. 2f. Halsted Prel. 

 List of Iowa Weeds. 42; Fink, Sperm. FL Fayette la. 94; 

 Fitzpatrick, Fl. S. la. 152; Man. Fl. PI. la. 95. 



CNICUS ALTISSIMUS, Willd. 



Cnicus altissimus, Willd. Sp. ^i: 1671. 



Ellis. Sk. 2:268. 1824. 



Gray. Proc. Am. Acad. 10: 42. 1874. 



Gray. Syn. Fl. N. Am. 1 : 404. 1884. 



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



6 Ed. 

 Cirsium altissimum, Spreng. Syst. 3: 373. 1826. 

 DeCandolle. Prodr. 6: 640. 1837. 



