IOWA ACADEMY OF SCIENCES. 
235 
C. filipendalus, Prof. A. S. Hitchcock has a note in Botan- 
nical Gazette referring to the distribution of this species, 
supposing it to be southern. 
The C. jilipendulus ( Cirsium filijpendulum , Engelmann), 
I believe is a good species. It is marked by its tuberous 
roots and deeply pinnatifid and spiny leaves. This species 
more nearly approaches C. discolor. It is not canescently 
tomentose as C. canescens. 
Distribution. — I would refer the following to C. canes- 
cens, No. 67, Sioux City, Pammel; northwest Iowa, Sept., 
’95, Pammel; Sioux City, Hitchcock; Sioux City, Pammel; 
Armstrong, Emmet County, Cratty; Montana, John Craig. 
The writer has seen this abundantly in the vicinity of 
Sheridan, Wyoming. 
It is the only one of our native species that occurs in 
patches. It is undoubtedly perennial; specimens in our 
herbarium from Montana by Professor Craig, show it to 
come from a deep seated root; and likewise, in the Gray 
herbarium. The writer has received the species quite fre- 
quently during the past four years from northwest Iowa, 
in which this opinion w T as expressed by those sending it. 
REFERENCES TO OCCURRENCE IN IOWA. 
Hitchcock, Notes on the FI. of la. Bot. Gazette. 14: 129. 
Pammel as C. undulatus and C. altissimus var. filipendulus 
in Notes on the FI. of West Iowa. 124. 
CNICUS NELSONI n. sp., Pammel. 
A branching biennial, plants from two to three feet high, some- 
what hairy, bearing numerous ochroleucus heads, which terminate 
the branches. Stem, prominently striated, white woolly at first, 
becoming smoothish with age. Leaves radical, five to six inches 
long, deeply pinnatifid, the prominent lobes with yellow spines, 
lower surface densely tomentose, upper woolly, becoming glabrate 
with age. The stem leaves sessile and decurrent, the upper two 
to six inches long, with prominent spiny lobes. The spine is yel- 
lowish. Leaves more or less canescently tomentose, upper surface 
arachnoid, woolly, becoming smoothish with age. Heads, one to 
one and a fourth inches high, rarely one and a half. Involucre 
somewhat turbinate. The bracts with a prominent glutinous ridge 
tipped with a yellow spine, outer bracts ovate-lanceolate, inner 
long acuminate and straw colored, tips minutely serrated. Flowers 
