IOWA ACADEMY OF SCIENCES. 
237 
tipped with a soft bristle, inner long acuminate, narrow lanceolate 
ending withanerose appendage. 
Distribution, Iowa. — Ames, Ball, Combs. Gilbert Sta- 
tion, G. W. Carver. Ontario, E. R. Hodson. Dubuque, L. 
H. Pammel. Muscatine, Ferd. Reppert. Ames, Hitchcock, 
:S. U. I. Mason City, B. Shimek. Des Moines, Pammel. 
North English, W. D. Fitz water. 
The specimens collected by A. S. Hitchcock at Ames 
have large heads and large flowers with the scarious erose 
hracts and acuminate anther tips. The basal outer bracts 
are very large. And in its genaral characters resembles 
specimens collected by Mead in Illinois and Westchester, 
Darlington and Trelease at Ithaca, N. Y., and by Engel- 
mann in the American bottoms opposite St. Louis. 
After an examination of a considerable amount of 
material I find that there is a great deal of morpho- 
logical variability in Cnicus Hillii and C. odoratus. The 
Cnicus Hillii seems to be quite variable, which is evidenced 
by the careful drawings of Messrs. Barnes, Reppert, and 
Miller. But in their figures the inner bracts are simply 
long acuminate. All the Muscatine specimens that I have 
examined reveal the fact that the inner bracts are not 
only long acuminate, but are erose; this seems to be true 
of all the specimens of this species which I have exam- 
ined. It is a good character. A specimen collected by 
William Boot in Cambridge, Mass., and preserved in the 
Gray Herbarium, is typical of C. odoratus; this has the 
appendages long acuminate, but not erose. It is possible, 
of course, that the C. odoratus may reach the state of 
Iowa, but it is doubtful. It seems to be an Atlantic coast 
species. 
REFERENCE TO OCCURRENCE IN IOWA. 
Arthur, Contr. FI. Ia. 1: 20. Hitchcock as Cnicus odor- 
atus, Muhl, Cat. Ant. & Pter., Ames. Barnes, Reppert, and 
Miller, FI. Scott and Muscatine Cos. 234, 281, pi. 1-2. 
Halsted, Prel. List Ia. Weeds 42. Fitzpatrick, Man. FI. 
PI. Ia. 95. 
