302 Petrak, Die nordamerikanischen Arten der Gattung Cirsium. 
ticulata, spinulis brevissimis inf irmis Stra- 
min e i s V 2 — 1 mm longis terminata, intima grada- 
tim longiora, lineari-lanceolata, paullatim vel abrup- 
tiuscule acuminata, dorso interdum plus 
minusve purpurascentia, apicc scariosa, 
straminea, fimbriato-lacerata. Corollae pur- 
pureae vel albidae limbus ad medium circiter inaequa- 
liter quinquefidus, laciniis angustissimis subobtusis, a tubo satis 
distinctus eoque duplo vel subduplo longior. Filamenta omnino 
parce crispule papilloso-pilosa. Pappus sordide albus, flosculis 
parum brevior, setis plumosis, apice saepe tantum scabridis, 
non vel parum dilatatis. Achaenia matura mihi ignota. Perenne ? 
Floret Junio — Julio. 
Synonyma: 
Echenais carlinoides var. nutans Gray in Proc. Acad. Nat. 
Sei. Philad. 1863, p. 69. 
Cnicus carlinoides var. Americanus Gray in Proc. Amer. 
Acad. X, p. 48 (1874). — Gray in Geoh Surv. Calif. Bot. I, p. 420 
(1876) excl. syn. C. scariosum Nutt. et loc. California.. 
Cnicus Americanus Gray in Proc. Amer. Acad. XIX, p. 56 
(1883). — Coulter, Man. Bot. Rocky Mount. Reg., p. 212 (1885). 
— Gray, Syn. Fl. North. Amer. II, p. 398 (1886). 
Cnicus Echinus O. Ivuntze, Rev. gen. plant. I, p. 328 (1891) 
excl. syn. plur. et quoad plant, americ. 
Carduus Americanus Greene in Proc. Acad. Nat. Sei. Philad. 
1892, p. 362 (1893) nec Rydberg in Bull. Torr. Bot. Club XXVIII, 
p. 508 (1901). — ? Piper, Flor. Washingt. in Contrib. U. S. Nat. 
Herb. XI, p. 609 (1906). 
Carduus Centaureae Rydberg in Bull. Torr. Bot. Club XXVIII ' 
p. 507 (1901). 
Cirsium Centaureae K. Schumann in Just’s Bot. Jahresb. 
XXIX, 1, p. 566 (1903). — Cockerell in Daniels, Flor. Boulder, 
Colo. p. 254 (1911) sec. Ind. Americ. 
Cirsium americanum Daniels, Flor. Boulder, Colo. p. 253 
(1911) sec. Ind. Americ. — Robinson in Rhodora XIII, p. 239 
(1911). 
Distributio: In pratis subalpinis vel alpinis, in regio- 
nibus centralibus montium „Rocky Mountains“, imprimis in civi- 
tatibus Colorado et Utah. 
Vidi e locis sequentibus: 
Colorado: Coulter P. O., Grand County, 12. VII. 1905 
Coli. G. E. Osterhout Nr. 3004 H. P. — Region of the Gunnison 
Watershed: Cimarron, alt. ca. 2000 m, 29. VI. 1901 Coli. C. F. 
Baker Nr. 286 H. U. W. 
Utah: Elk Mountains, near Scorup’s Camp alt. 2500 m, 
8. VIII. 1911, Coli. P. A. Rydberg et A. O. Garrett Nr. 9515 H. P. 
