554 Rypsperc: Rocky MOouNTAIN FLORA 
ones are not so elongated as in that species. From C. undulatus 
it differs in the narrower segments of the leaves, the glabrate upper 
surface of the same, the somewhat purple-tipped inner bracts, 
and the inconspicuous dorsal ridge. 
Utau: Fish Lake, near Twin Creeks, Aug. 8, 1905, Rydberg 
& Carlton 7499 and 7487; Beaver City, 1877, Palmer 273. 
Cotorapo: Grand Junction, June 15, 1900, Mrs. Stokes. 
Neither of the supposed parents was collected at the same 
date and locality, but both are found in Utah and Colorado. C. 
pulchellus was collected by Carlton and myself in the neighborhood 
of Marysvale, nos. 7016 and 7179. 
A good deal can be said about the treatment of this genus in 
the New Manual of Botany of the Central Rocky Mountains. 
Many of the species, reduced to synonymy, have little or no re- 
lationship to those of which they were made synonyms. 
Under Carduus americanus we find the following synonyms: 
C. Centaureae Rydb., C. erosus Rydb., and C. griseus Rydb. 
The first isa puresynonym. When the name was proposed I was 
following the. Madison amendments of the ‘Rochester Code,” 
and according to those amendments an older varietal name in- 
validated the name C. americanus. C. erosus 1 now think is a 
hybrid of C. americanus and C. coloradensis. C. griseus, on the 
contrary, is a good species, easily distinct from C. americanus, 
and its bracts have no dilated erose tips. In my Flora of Colorado 
I included in it at least two hybrids of C. americanus with this 
species and related ones. This may have given Professor Nelson 
a wrong idea of C. griseus. 
Under Carduus Hookerianus we find as a synonym C. Oster- 
houttt. C. Hookerianus is, so far as I know, not found within the 
United States. It is from the Saskatchewan region. I, as well 
as Others, have referred specimens from Colorado to it, but all 
these belong to a form of C. scopulorum. This may have been the 
reason why Nelson has made the latter a variety of C. Hookeri- 
anus under the name C. Hookerianus eriocephalus. C. Osterhoutit 
neice” 
Wade Ge porn — species and C. griseus. 
ocephalus we find the follow- 
