Petrak, Die nordamerikanischen Arten der Gattung Cirsium. 413 
oblongo-lanceolata vel lanceolata, subremote 
sinuato-pinnatifida, laciniis profunde spinoso-dentatis 
spinis crebrioribus validioribusque armatis, ceterum ut folia 
caulina inferiora. 
Capitula in apice caulis et ramorum s o 1 i t a r i a vel 2 — 3 plus 
minusve aggregata, breviter pedunculata vel sub- 
sessilia, bracteis 1 — 2 lineari-lanceolatis 
spinoso-dentatis, dentibus ad spinas iere 
omnino reductis, capitulis multo breviori-. 
bus, raro subae'q uilongis suffulta, ovata 
vel ovato-oblonga, cum flosculis 3 1 / 2 — 4 cm longa, 
2 — 2 1 / 2 cm lata, basi plus minusve dilatata et excavata. Involucri 
parcissime arachnoidei vel fere glabres- 
c e n t i s foliola exteriora et media e basi ovato-ob- 
longa abruptiuscule attenuata, dorso vis- 
cido-carinata, spinis stramineis erecto- 
patentibus subvalidis rigidis 4 — 5 mm longis 
terminata, interiora et intima lineari-lanceolata elongato- 
acuminata, apice saepe plus minusve purpuras- 
centia vel Stramin ea, undulatö-curvata nec rigida. 
Corollae purpureae vel roseae raro albidae limbus parum plus 
quam ad unam tertiam vel fere ad medium inaequaliter quinque- 
fidus, laciniis angustissimis linearibus subobtusis, a tubo vix 
vel satis distinctus eoque parum longior vel subaequilongus. 
Filamenta parce papilloso-pilosa. Pappus sordide albus setis 
interdum flosculorum exteriorum omnino tantum scabridis, 
interiorum plumosis, apice saepe tantum scabridis ibique non 
vel parum clavellatis. Achaenia matura oblonga vel ovato-oblonga, 
brunnea, canescentia vel fusco-nigrescentia, 5 — 7 mm longa, 
2 — 2 1 / a mm lata, nitida. Bienne. Floret J u n i o — Augusto. 
Synonyma: 
Carduus undulatus Nutt., Gen. N. Amer. PI. II, p. 130 (1818). 
— Greene in Proc. Acad. Nat. Sei. Philad. 1892, p. 359 (1893). 
— Porter in Mem. Torr. Bot. C4ub V, p. 345 (1893 — 94). — ? Hol- 
zinger in Contrib. FT. S. Nat. Herb. III, p. 236 (1895). — Bush 
in Miss. Bot. Gard. VI, p. 131 (1895). — Rydberg, Fl. Black hills 
in Contrib. U. S. Nat. Herb. III, p. 510 (1896). — Britton et 
Brown, Illustr. Fl. North U. S. III, p. 480, Fig. 4063 (1898). — 
Britton, Man. Fl. North Stat. Canad., p. 1032 (1901). — Piper, 
Fl. Wash. in Contrib. LT. S. Nat. Herb. XI, p. 610 (1906). — 
St. Brown, Alp. Fl. Canad. Rocky Mount., p. 321 (1907). 
Cirsium undulatum Spreng., Syst. veg. III, p. 374 (1826). 
— DC., Prodr. VI, p. 651 (1837). — Gray, Plant. Wright. II, 
p. 101 (1853). — Gray in Rep. Expl. Surv. Rout. Railr. Miss. 
Pac. Oc. IV, 5, p. 112 (1856). — Torr, et Gray in Rep. Expl. Surv. 
Railr. Rout. Miss. Pac. Oc. Bot., p. 167 (1857). — ? Gray ap. Torr, 
in Rep. U. S. Mcxic. Bound Surv. I, p. 103 (1859). — Gray, Man. 
Bot. North U. S. 5. ed. p. 273 (1868 )t-^— Eaton ap. Watson in 
U. S. Geol. Expl. Fort. Parall. CI. King V. Bot., p. 194 (1871). 
— Port, et Coult. Syn. Fl. Colo., p. 84 (1874). — Bruhin in Verh. 
