442 Pctrak, Die nordamerikanischen Arten der Gattung Cirsium. 
purpurascens, apicem versus ramosissiraus, 
r a m i s plus m inusve elongatis, rernote f o 1 i - 
osis v e 1 subnudis, monocephalis. Folia radicalia 
mihi ignota; cauliija inferiora basi late semiauricu- 
lato-semiamplexicauli sessilia, non vel bre- 
viter dccurrentia, supra glabrescentia vel 
parcissime arachnoi dea, subtus parce arach- 
noideo-tomentosa, canescentia, e basi late j 
ovato-oblonga lanceolata, paullatim atte- j 
nuata, abruptiuscule acuminata, i n d i v i s a , 
m argine tantum brevissime denticulata, 
spinn loso-ciliata, spinulis infirmis strami- 
neis 1 — 2 mm longis; caulina superiora et suprema 
supra glabrescentia subtus subdense arachnoidco-tomentosa basi 
late semiauriculato-semiamplexicauli sessilia, breviter — j 
ad 1 cm — decurrentia, alis latis, basi rotun- 
d a t i s , spinuloso-ciliatis, lanceolata, abruptiuscule acuminata, 
indivisa, margine brevissime denticulata spinis stramineis 1 — 3 mm 
longis infirmis spinuloso-ciliata. 
Capitula in apice caulis et ramorum solitaria ebrac- 
teata vel bracteis 1 — 2 multo minoribus 
linear i-lanceolatis, margine spinuloso-cili- 
atis suffulta, ovato-oblonga vel ovata, cum flos- 
culis 3 cm longa, 12 — 15 mm lata, basi parum dilatata, abrup- 
tiuscule in pedunculum contracta nec e x - 
cavata. Involucri glabrescentis vel parcissime 
arachnoidei foliola exteriora et media ovato-ob- 
longa abrupte atte nuata, dorso perparum 
viscido-carinata, spinulis infirmis strami- 
neis 1 — l l / 2 mm longis, basi saepe plus mi- 
nus v e purpurascentibus, horizontaliter vel 
erecto-patentibus terminata; interiora et intima 
gradatim longiora, lineari-lanceolata, elongato-acuminata, i m - 
primis apicem versus plus minusve pur- 
pur a s c e n t i a vel rosea, subscariosa, plus 
minusve undulato-curvata. Corollae purpu- 
re a e , roseae vel albidae limbus ad medium circiter inaequa- 
liter quinquefidus laciniis angustissimis linearibus subobtusis, 
a tubo satis distinctus eoque parum longior vel subaequilongus. 
Filamenta omnino dense longiuScule crispule papilloso-pilosa. 
Pappus tubo flosculorum parum longior, sordide albus, setis 
interdum nonnullis omnino tantum scabridis, ceteris plumosis 
apice tantum scabridis, parum clavellatis. Achaenia matura 
pallide brunnea vel fusca, 5 — 6 mm longa, 3 — 3Vo m m 
lata, oblonga, compressa, nitida. Bienne ? Floret J u 1 i o — 
A u g u s t o. 
Synonyma: 
Carduus perplexans Rydberg in Bull. Torr. Bot. Club XXXII, 
p. 132 (1905). 
