Petrak, Die nordamerikanischen Arten der Gattung Cirsium. 445 
in Gesellschaft des C. perplexans vorkommende Cirsien werden 
eine sichere Entscheidung dieser Frage bringen können. 
Paniculata. Folia plus minusve decurrentia. Caulis erectus, 
ramosus, ramis plus minusve elongatis subnudis, monocephalis. 
Capitula mediocria vel parva, ovato-globosa vel globosa. In- 
volucri glabrescentis vel parcissime arachnoidei foliola exteriora 
et media dorso non vel parurn viscido-carinata, spinis infirmis 
brevibus vel subvalidis longioribus terminata. 
44. Cirsium Wrightii. 
Caulis erectus, certe ad ld/g m altus, sulcato-striatus, parce 
arachnoideo-pilosus, subdense vel fere remote foli- 
osus, a medio circiter vel apice tan tum 
ramosus, ramis plus minusve elongatis sub- 
nudis, monocephalis, raro sub capitulister- 
minalibus 1 — 2 capitula minora, saepe sub- 
a b o r t i v a. Folia radicalia utrinque tenuiter arach- 
noidea, canescentia vel glabrescentia, in 
petiolum angustissime alatum spinuloso-dentatum paullatim atte- 
nuata, ambitu lanceolato-oblonga vel lanceo- 
lata, subremote sinuato-lobata, lobis tri- 
angulari-ovatis vel triangularibus, pro- 
funde breviterque spinoso-dentatis, denti- 
bus triangularibus acuminatis, margine spinuloso- 
ciliatis, spinulis stramineis, infirmis vel sub- 
validis, 1 — 3 mm longis terminatis; caulina 
inferiora et media basi angustata vix semiamplexicauli sessilia, 
plus minusve, plerumque omnino decurren- 
tia, alis angustis vel angustissimis, remote 
spinoso-dentatis, ambitu oblonga, ad me- 
dium circiter remote sinuato-pinnatifida, 
laciniis triangularibus vel triangulari-ovatis, inaequaliter spinoso- 
dentatis, ceterum foliis radicalibus similia; caulina superiora gra- 
datim minora, ambitu lanceolata vel lineari- 
lanceolata, remote sinuato-dentata, dentibus 
triangularibus acuminatis, spinulis infirmis ad 4 mm longis termi- 
natis; caulina suprema multo minora braeteiformia, linearia vel 
lineari-lanceolata, paullatim acuminata, integerrima vel basi 
tantum breviter spinoso-dentata. 
Capitula in apice caulis et ramorum s o 1 i t a r i a vel raro 
sub capitulum terminale 1—2 capitula plus minusve abortiva, 
cbracteata, basi parum dilatata, excavata, ovato- 
globosa vel globosa, cum flosculis 20 — 28 mm longa, 
18 — 22 mm lata. Involucri glabrescentis vel par- 
cissime arachnoidei foliola exteriora et media e basi 
o v a t a lanceolata, abruptiuscule acuminata, 
dorso viscido-carinata, spinulis infirmis 
b r e v i s s i m i s vix l / 2 mm longis stramineis 
terminata, appressa, apice tantum parum 
