342 P e t r a k , Die nordamerikanischen Arten der Gattung Cirsium. 
reductis, paullatim attenuata, ambitu lanceolata vel 
o b 1 o n g o - 1 a n c e o 1 a t a , subremote sinuato- 
pinnatifida, laciniis inaequaliter bifidis, 
lobis lanceolatis, paullatim attenuatis bre- 
viter dentatis, margine spinuloso-ciliatis, spinis sub- 
validis stramineis 2 — 37 2 mm longis terminatis; folia caulina 
inferiora basi angustata sessilia, breviter — ad 1 cm — d e - 
currentia, supra parcissime arachnoidea vel fere glabres- 
centia, subtus parce arachnoideo-canescentia ; caulina superiora 
gradatim scd parum minora, basi semiauriculato-semiamplexi- 
cauli sessilia, non vel brevissime decurrentia, ambitu anguste 
lanceolata remote sinuato-lobata, lobis late triangularibus vel 
triangulari-ovatis, interdum ad spinas fere omnino reductis, 
spinis stramineis 6 — 11 mm longis subvalidis terminatis, margine 
spinuloso-ciliatis. 
Capitula intra folia caulina suprema nidu- 
lantia, sessilia vel subsessilia, plus minusve 
aggregata, globosa vel ovato-globosa, cum 
flosculis ad 3 cm longis, 2 — 2 1 / 2 cm latis, basi vix excavata 
non vel parum dilatata. Involucri subdense vel dense 
arachnoidei e basi ovato-oblonga paullatim acuminata, 
dorso subcarinata nec viscida, ad duas ter- 
tias circiter erecto- vel subrecurvo-paten- 
tia, paullatim in spinas subvalidas brunneo- 
stramineas 3 — 5 mm longas excurrentia; foliola 
interiora et intima gradatim sed parum longiora, lineari- 
lanceolata, paullatim acuminata nec rigida. Corollae 
purpureae vel raro albidae limbus ad medium circiter inaequaliter 
quinquefidus, laciniis angustissimis linearibus subobtusis, a tubo 
vix vel satis distinctus eoque parum longior vel subaequilongus. 
Filamenta subdense longiuscule crispule papilloso-pilosa. Pappus 
sordide albus flosculis parum brevior, setis plumosis, apice inter- 
dum tantum scabridis, non vel vix clavellatis. Achaenia matura 
oblonga, fusco vel fusco-nigrescentia.compressa, subnitida, 5 — 6 mm 
longa, 2 1 / 2 — 3 mm lata. Perenne. Floret J ulio — August o. 
Synonyma: 
Cirsium eriocephalum Gray in Proc. Acad. Nat. Sei. Philad. 
1863 p. 69 in adnot. — Porter et Coulter, Syn. Fl. Colo. p. 84 
(1874). — D.C. Eaton in U. S. Geol. Explor. Fort. Parall. CI. King V. 
Bot. p. 196 (1871) nec Wallr. in Linnaea XIV. p. 632 (1840). 
Cnicus eriocephalus Gray in Proc. Amer. Acad. X. p. 46 (1874). 
— Coulter, Man. Bot. Rocky Mount. Reg. p. 212 (1885). — Gray, 
Syn. Fl. North, Amer. II. p. 399 (1886). 
? Cirsium foliosum Porter et Coulter, Syn. Fl. Colo. p. 84 (1874) 
p. p. nec DC. Prodr. VI. p. 654 (1837). 
Carduus scopulorum Greene in Proc. Acad. Nat. Sei. Philad. 
1892, p. 362 (1893). — Rydberg, Cat. Fl. Mont, in Mem. N. Y. Bot. 
Gard. I. p. 449 (1910). — Soth in Bull. Torr. Bot. Club XXXVIII. 
p. 269 (1911). 
