Petrak, Die nordamerikanischen Arten der Gattung Cirsium. 335 
liter bi- vel trifidis, lobis late ovato-ob- 
longis vel lanceolato-oblongis, valde diver- 
gentibus subobtusis spinoso-ciliatis, spinis stra- 
mineis subvalidis 2 — 6 mm longis terminatis, 
in petiolum anguste alatum spinoso-dentatum, dentibus ad spinas 
fere omnino reductis paullatim attenuata; caulina inferiora ses- 
silia, non vel brevissime decurrentia, quasi in 
petiolum anguste alatum, fere pectinato-spinuloso-ciliatum paulla- 
tim attenuata, alte sinuato-pinnatifida, ceterum foliis radicalibus 
similia; caulina superiora et suprema basi late semiauriculato- 
semiamplexicauli profunde spinoso-dentata sessilia, breviter — 
ad 1 cm — decurrentia, alis latis profunde spinoso- 
dentatis, utrinque g 1 a b r e,s c e n t i a vel subtus 
tantum parce arachnoidea, canescentia, ambitu oblonga remote 
sinuato-pinnatifida, laciniis profunde spinoso-dentatis, late ovatis, 
dentibus triangularibus acuminatis, paullatim in spinas brunneo- 
stramineas validas, 8 — 15 mm longas excurrentibus. 
Capitula in apice caulis et ramorum solitaria vel 
saepe 2 — 3 subaggregata subsessilia vel bre- 
viter pedunculata, bracteis 3 — 10 exteriori- 
bus foliis supremis omnino simillimis, in- 
timis lineari-lanceolatis, remote spinoso- 
dentatis, dentibus ad spinas fere omnino 
reductis pectinato-spinulosis, capitulis p a - 
rum longioribus vel saepe plus minusve bre- 
vioribus suffulta, globosa vel ovato-glo- 
b o s a , basi excavata parum dilatata, 3 — 3 1 / 2 cm longa, 2V 2 — 3 cm 
lata. Involucri glabrescentis vel parce arach- 
n o i d e i foliola exteriora et media e basi ovato-oblonga 
a medio circiter a b r u p t i u s c u 1 e attenuata, 
erecto- vel plus minusve r e c u r v o - p a t e n t i a 
dorso subcarinata, paullatim in spinas 
brunneo-stramineas subvalidas 2—4 mm lon- 
gas attenuata; interiora et intima gradatim sed parum 
longiora, lineari-lanceolata elongato-acuminata, 
apice plus minusve purpurascentia nec ri- 
gid a. Corollae purpureae raro albidae limbus ad medium cir- 
citer fere aequaliter vel irregulariter quinquefidus, laciniis angustis 
linearibus subobtusis, a tubo satis vel vix distinctus eoque parum 
longior vel subaequilongus. Filamenta longiuscule crispule pa- 
pilloso-pilosa. Pappus sordide albus flosculis parum brevior, setis 
plumosis, apice tantum scabridis ibique parum dilatatis. Achaenia 
matura fusca vel fusco-nigrescentia, oblonga, 4 x / 2 — 5 mm longa, 
2 mm lata. Perenne ? Floret Junio — Julio. 
Synonyma: 
Cnicus Hallii Gray in Proc. Amer. Acad. XIX, p. 56 (1883). 
— Gray, Syn. Fl. North Amer. II, p. 399 (1886). 
Carduus Hallii A. A. Heller, Cat. North Amer. Jd. p. 7 (1900). 
— Parish in Erythea VII, p. 97 (1899). — ? Rydberg Cat. Flor. 
Mont, in Mem. New York Bot. Gard. I, p. 450 (1910). 
