228 IOWA ACADEMY OF SCIENCES. 



Tall braDching perennial, three to eight feet high, stem striate, 

 smooth with age, few leaved, branches bearing few medium-sized 

 heads with purple flowers; leaves deeply pinnatifid, divisions lanceo- 

 late, the principal lobes somewhat spiny, upper surface slightly 

 roughened, lower decidedly arachnoid, woolly when young, less so 

 with age; heads one to one-fourih inches high, scales of the invo- 

 lucre closely appressed, cobwebby, outer with a broad base and a 

 glutinous line on back, inner long acuminate, appendage with ser- 

 rated margins, flowers purple, tube seven and one-half lines long, 

 lobes three lines long, anthers with acute tips, appendage pubes- 

 cent, filaments hairy, bristles of pappus of outer flowers barbellate, 

 inner plumose, achenes one and three-fourths lines long, smooth. 



Distribution, /om;^.— Mason City, Forest City, Winne- 

 bago county, Shimek. S. U. I, 



REFERENCE TO OCCURRENCE IN THE STATE. 



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



CNICUS DISCOLOR, Muhl. 



Cnicus discolor. Muhl. Willd. Sp. 3:1670. 1804. 



Ell. Sk. 2: 271. 



C. altissimus, var. discolor. Gray. Proc. Am. 



Acad. 1 : 40. 1884. 

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



6 Ed. 

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



DeCandolle. Prodr. 6: 640. 1837. 



Torrey & Gray. Fl. N. Am. 2: 457. 1843. 



Gray. Man. 273 1868. 5 Ed. 



Carduus discolor, Nutt. Gen. 2: 130. 1818. 



Britton & Brown. Illustr. Fl. N. St. 3: 485. 



/. 4060. 1898. 

 Serratula discolor, Poir. Diet. Enc. 6: 565. 



Tall, branching, leafy perennial, Ave to seven feet high, with 

 heads larger than C. altissimus, stem striate, slightly hirsute; 

 leaves radical, twelve to fourteen inches long, dneply pinnatitid, 

 the divisions frequently divided, prickly toothed, the upper surface 

 slightly hirsute, the lower woolly, stem leaves deeply pinnatifid, 

 linear or linear-lanceolate with falcate segments, ihe larger twice 

 or thrice cut, tipped with prickly spines, upper surface smoothish, 

 the lower white, woolly; single heads terminating the branches, 

 with purple flowers; heads one and one-half inches high; bracts of 

 the globose involucre somewhat appressed, slightly arachnoid. 



