Petrak, Die nordamerikanischen Arten der Gattung Cirsium. 419 
versus dorso viscido-carinata, spinis stra- 
mineis subpatulis 4 — 5 mm longis subvalidis 
erecto-patentibus terminata, interiora et intima 
multo longiora linearia, elongato-acuminata, apice plus minusve 
undulato-curvata, subscariosa nec rigida. Corollae purpureae 
vel roseae limbus vix ad medium inaequaliter quinquefidus, 
laciniis angustis linearibus abruptiuscule acuminatis vel sub- 
obtusis, a tubo non vel vix distinctus eoque circiter duplo fere 
brevior. Filamenta parce crispule papilloso-pilosa. Pappus sordide 
albus setis plumosis apice saepe tantum scabridis, non vel parum 
clavellatis. Bienne. Floret M a i o — J u 1 i o. 
Synonyma: 
? Cirsium undulatum Gray, PI. Wright. I, p. 125 (1852). 
Carduus Helleri Small, Fl. Southeast. U. S., p. 1306, 1307 
(1903). 
Carduus austrinus Small, Fl. Southeast. U. S.,'p. 1306, 1307 
(1903). 
Cirsium undulatum ssp. Helleri Petrak in Schedis 1911 — 12. 
Vidi e locis sequentibus: 
Texas: Sine loco speciali Coli.? W- N. W. — Fcdado: 
Comanche Spring, New Braunfels V. 1849 Coli. Lindheimer Nr. 896 
H. N. W„ H. U. Kop. 
Kansas: Riley County, Prairie 17. VII. 1895 Coli. J. B. 
Norton Nr. 308 H. H. 
Missouri: Independence, Jackson County, introduced 
22. VII. 1895 Coli. B. F. Bush Nr. 325 H. U. W. 
2. Var. durangense. 
Caulis erectus h u m i 1 i s 20—50 cm altus, dense fo- 
liosus, simplex monocephalus vel apice tan- 
tum parce breviterque ramosus. Folia caulina 
inferiora et media supra parce arachnoidea, subtus 
arachnoideo-tomentosa, albida, basin versus 
quasi in petiolum anguste alatum spinuloso-dentatum attenuata, 
ambitu oblonga vel 1 a n c e o 1 a t o - o b 1 o n g a , 
alte s i n u a t o - p i n n a t i f i d a , laciniis ad basin 
fere inaequaliter bifidis, lobis anguste 
lineari-lanceolatis paullatim acuminatis, 
margine plus minusve revolutis brevissime 
spinuloso-denticulatis, spinis subvalidis ad 6 mm 
longis terminatis; caulina superiora et suprema gradatim minora, 
basi late semiamplexicauli sessilia, n o~n vel brevissime 
decurrentia. 
Capitula in apice caulis et ramorum solitaria, brac- 
teis 1 — 3 minoribus foliis caulinis supremis 
omnino simillimis, magis remote sinuato- 
pinnatifidis suffulta, basi vix dilatata non excavata, 
ovato-globosa, cum flosculis ad 4 cm longa, 3 cm lata. 
Involucri parce arachnoidei foliola exteriora et media 
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