*330 Petrak, Die nordamerikanischen Arten der Gattung Cirsium. 
I 
glaberrima, subtus arachnoideo-tomentosa, alte sinuato- 
pinnatifida, laciniis inaequaliter bi- vel 
trifidis, lobis divergentibus lanceolatis vel 
lanceolato-triangularibus, subobtusis vel 
abruptiuscule acuminatis, .spinuloso-ciliatis, spinis 
stramineis subvalidis, 1 — 4 mm longis terminatis; caulina superiora 
gradatim sed parum minora, utrinque glabrescentia vel subtus 
parcissime arachnoidea, basi semiamplexicauli profunde spinoso- 
dentata sessilia, non vel brevissime decurrentia, ambitu lanceolata, 
remote sinuato-lobata, lobis late triangularibus vel triangulari- 
lanceolatis, abrupte acuminatis vel subobtusis, spinuloso-ciliatis, 
spinis subvalidis stramineis 2—6 mm longis armatis. 
Capitula in apice caulis 2 — 3 subaggregata, 
breviter pedunculata, praeterea in axillis 
foliorum superiorum 3 — 4 breviter pedun- 
culata vel subsessilia, racemose vel spi- 
catim disposita, bracteis 3 — 6 exterioribus 
foliis supremis omnino simillimis, capitu- 
lis subaequilongis vel raro parum longiori- 
bus, interioribus lineari-lanceolatis, i m - 
primis basin versus dense pectinato-spinu- 
losis, gradatim in foliola exteriora transe- 
untibus suffulta, basi vix dilatata, parum excavata, 
ovato-globosa vel globosa, cum flosculis 3 — 3 J / 2 cm 
longa, 2 1 / 2 — 3 cm lata. Involucri subdense arachnoideo- 
1 a n a t i foliola omnia subaequilonga, exteriora et 
media e basi ovato-oblonga paullatim acuminata, 1 i n e a r i 
lanceolata, ad duas tertias fere horizonta- 
liter vel erecto-patentia, dorso subcarinata 
paullatim in spinas basi subpatulas brun- 
neo-stramineas subvalidas, 3 — 6 mm longas 
excurrentia, intima non vel vix longiora, 
lineari-lanceolata, paullatim attenuata elongato-acumi- 
nata, nec spinosa, nec scariosa, apice plus minusve erecto- 
vel subrecurvo-patentia, raro subappressa, undulato-curvata. 
Corollae purpureae vel albidae limbus vix ad medium inaequaliter 
quinquefidus, laciniis angustissimis linearibus, abruptiuscule acu- 
minatis vel subobtusis, a tubo bene distinctus eoque parum 
longior vel subaequilongus. Filamenta basi glabrescentia, apicem 
versus dense longiuscule 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 J u n i o — J u 1 i o. 
Synonyma: 
Cirsium Drummondii D. C. Eaton in U. S. Geol. Explor. Fort. 
Parall. CI. King V. Bot. p. 195 (1871) p. p. ? nec Torr, et Gray 
Flor. North Amer. II. 3. p. 459 (1843). 
Carduus oreophilus Rydberg in Bull. Torr. Bot. Club XXVIII- 
p. 509 (1901). 
