IOWA ACADEMY OF SCIENCES. 235 



'C.filipendiilus, 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. JUipendulus {Cirsiiim filipendulum, Engehiiann), 

 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. canesceiis. 



Distrihnflon. — 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 w^riter 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 was expressed by those sending it. 



REFERENCES TO OCCURRENCE IN IOWA. 



Hitchcock, Notes on the Fl. of la. Bot. Gazette. U: 129. 

 Pammel as C. nndulatus and C. altissimus \?iV. filipendulus 

 in Notes on the Fl. 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 tirst, 

 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 



