Petrak, Die nordamerikanischen Arten der Gattung Cirsium. 305 
5. Cirsium callilepis. 
Radix mihi ignota. Caulis erectus, 30 — 100 cm altus, parce 
arachnoideo-pilosus, striato-sulcatus remote foliosus, a medio cir- 
citer ramosus, ramis valde elongatis remote bre- 
viterque foliosis vel fere nudis, monocepha- 
1 i s. Folia radicalia mihi ignota; caulina inferiora supra glabres- 
centia vel parcissime arachnoidea, subtus arachnoideo-tomentosa, 
canescentia vel albida, quasi in petiolum anguste alatum spinu- 
loso-ciliatum paullatim attenuata, basi semiamplexicauli sessilia, 
plus minusve, saepe ad medium circiter de - 
currentia, alis a n g u s t i s s i m i s integerrimis 
spinuloso-ciliatis, ambitu elongato-lanceo- 
lata vel fere 1 i n e a r i - 1 a n c e o 1 a t a , integer- 
rima vel medio tantum remote sinuato- 
pinnatifida, laciniis ad medium circiter i n - 
aequaliter.bifidis, lobis lanceolatis abruptiuscule acu- 
minatis vel subobtusis, spinulis infirmis stramineis 1 — 5 mm 
longis terminatis; caulina media et superiora multo minora, 
basi semiamplexicauli sessilia, plus minusve inter- 
dum fere omnino decurrentia, anguste 
lanceolata, apicem versus latissima, medio 
tantum remote sed alte sinuato-pinnatifida, ceterum ut 
folia caulina inferiora; caulina suprema lineari-lanceolata, quasi 
bracteiformia, integerrima, margine fere pectinatim spinuloso- 
ciliata. 
Capitula in apice caulis et ramorum solitaria ebracteata 
vel bracteis 1 — 2 subaequilongis vel brevi - 
oribus foliis supremis omnino simillimis 
suffulta, ovato-globosa vel globosa, cum flos- 
culis 28 — 35 mm longa, 25—30 mm lata, basi vix dilatata nec 
excavata, abruptiuscule in pedunculum con- 
tra c t a. Involucri parcissime arachnoidei vel fere glabrescentis 
foliola exteriora et media subfoliacea obscure vires- 
centia, lineari-lanceolata, paullatim atte- 
nuata et acuminata, apicem versus parum 
erecto-patentia, margine pectinatim spinu- 
loso-ciliata, spinulis infirmis 1 — 3 mm longis; 
inferiora et intima lineari-lanceolata, paullatim attenuata, api- 
cem versus dorso plus minusve purpuras- 
centia, apice plus minusve undulato-cur- 
v a t a. Corollae purpureae limbus ad medium circiter irregulariter 
quinquefidus, laciniis angustissimis linearibus paullatim acuminatis, 
a tubo vix vel satis distinctus eoque parum brevior vel subaequi- 
longus. Filamenta imprimis apicem versus dense longiuscule 
crispule papilloso-pilosa. Pappus sordide albus setis plumosis, 
apice saepe tantum scabridis ibique interdum plus minusve cla- 
vellatis. Achaenia matura oblonga compressa, fusco-canescentia 
vel fusca, 4 — 4V 2 mm longa, 2 mm lata, nitida. Bienne ? Floret 
Augusto — Septembri. 
Beihefte Bot. Centralbl. Bd. XXXV. Abt. II. Heft 2/3. 
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