Petrak, Die nordamerikanischen Arten der Gattung Cirsium. 431 
triangulari-lanceolatis, margine spinuloso-ciliatis, 
breviter denticulatis, subobtus-is vel abrup- 
tiuscule acuminatis, spinis stramineis s u b - 
validis 1 — 5 mm longis terminatis; caulina 
inferiora radicalibus omnino simillima, basi semiauriculato-semi- 
amplexicauli sessilia, breviter decurrentia; caulina 
superiora et suprema gradatim minora, e basi semiamplexi- 
cauli ovato-oblonga lanceolata, nunc vix 
ad medium, nunc omnino fere decurrentia, 
alis latis, profunde spinoso-dentatis, sub- 
dense vel plus minusve remote sinuato-pinnatifida vel repando- 
dentata, laciniis saepe irregulariter bi- vel tridentatis, dentibus 
triangularibus subobtusis vel abruptiuscule acuminatis, spinis 
infirmis vel subvalidis 5 — 8 mm longis armatis, spinuloso-ciliatis. 
Capitula in apice caulis et ramorum solitaria, ebr-ac- 
t e a t a vel bracteis 1 — 2 multo minoribus lineari- 
lanceolatis, spinuloso-ciliatis suffulta, basi plus minusve 
excavata et dilatata, globosa vel ovato-globosa, 
cum flosculis 3 x / 2 — 5 cm longa, 3—4 cm lata. Involucri parce 
arachnoidei vel fere glabrescentis foliola ex- 
teriora et media e basi ovato-oblonga lanceolata, 
abruptiuscule attenuata, dorso plus mi- 
nusve viscido-carinata, spinis subvalidis 
stramineis erecto-patentibus, basi sub- 
patulis 3 — 5 mm longis terminata; interiora 
gradatim longiora exterioribus simillima; intima linearia vel 
lineari-lanceolata, nunc elongato-acuminata, nunc 
apice plus minusve dilatata subscariosa, 
undulato-curvata, straminea, margine plus 
minusve crose fimbriato-denticulata. Corollae 
ochroleucae vel albidae limbus vix ad me- 
dium inaequaliter quinquefidus, laciniis an- 
gustissimis linearibus subobtusis, a tubo vix vel satis distinctus 
eoque parum longior vel subaequilongus. 
Filamenta omnino dense longiuscule crispule papilloso-pilosa. 
Pappus flosculorum exteriorum setis plerumque omnino tantum 
scabridis, interiorum plumosis, apice tantum scabridis, parum 
vel non clavellatis. Achaenia matura oblonga, compressa, fusca, 
pallide brunnea vel brunneo-canescentia, nitida, — 7 mm longa, 
2 — 3 mm lata. Bienne. Floret J u n i o — Septembri. 
Synonyma: 
Cirsium unclulatum Gray in Expl. Surv. Railr. Rout. Miss. 
Pacif. Oc. Bot. Riep. Nr. 2, p. 41 (1859). — Porter et Coulter, 
Syn. F. Colo., p. 84 (1874) p. p. 
Cnicus Hookerianus var. Gray, Pac. R. Rep. XXI, p. 45 sec. 
Rydberg, Fl. Nebrask. in Contrib. U. S. Nat. Herb. III, p. 1G7 
(1895). 
Cnicus Pitcheri Gray, Syn. Fl. North Amcr. II, p. 403 (1886) 
p. p. — Bessey in Contrib. Bot. Dept. Univ. Nebrask. New. Ser. III, 
p. 53 (1892)." 
