Petrak, Die nordamerikanischen Arten der Gattung Cirsium. 397 
mis basin versus sinuato-lobata; caulina inferiora 
et media basi semiauriculato-semiamplexicauli sessilia, non v e 1 
raro brevissime decurrentia, ambitu lanceolata 
vel oblongo-lanceolata, remote sinuato-dentata vel 
sinuato-pinnatifida, laciniis lanceolatis 
paullatim attenuatis, basin versus inaequa- 
liter bi- vel tridentatis, dentibus triangu- 
laribus vel lanceolato-triangularibus acu- 
minatis, margine spinuloso-ciliatis, spinulis stramineis in- 
firmis vel subvalidis 1 — 4 mm longis terminatis; caulina superiora 
et suprema parum minora, ambitu lanceolata, remote sinuato- 
dentata, dentibus triangularibus acuminatis, spinulis infirmis 
stramineis 2 — 4 mm longis terminatis. 
Capitula in apice caulis et ramorum s o 1 i t a r i a vel 2 — 4 fere 
racemose disposita, breviter pedunculata, b r a c t e i s 1 — 2, 
raro 6—15 lineari-lanceolatis remote sinuato- 
dentatis subaequilongis vel plerumque d i - 
midio fere bre vioribus raro paullum longi- 
oribus saepe quasi rosulatis suffulta, ovata 
vel ovato-globosa, basi dilatata, vix excavata, ple- 
rumque abruptiuscule in pedunculum con- 
tra c t a , cum flosculis 4 — 4 x / 2 cm longa, 2 1 / 2 - — 3 cm lata. In- 
volucri parce vel parcissime arachnoidei foliola 
arte imbricata, exteriora et media e basi ovato-oblonga 
paullatim acuminata in spinas stramineas 
2 — 3 1 / 2 mm longas subvalidas erecto- vel sub- 
recurvo-patentes abruptiuscule excurren- 
tia, dorso viscido-carinata, interiora et intima 
lineari-lanceolata, paullatim acuminata in 
appendices triangulari-lanceolatas paullatim acuminatas sub- 
scariosas, stramineas, margine breviter eroso-denticulatas dilatata. 
Corollae purpureae vel raro albidae limbus ad medium circiter 
inaequaliter quinquefidus, laciniis angustissime linearibus sub- 
obtusis, a tubo vix vel satis distinctus eoque parum longior vel 
subaequilongus. Filamenta omnino dense crispule papilloso-pilosa. 
Pappus sordide albus flosculis parum brevior, setis plumosis, apice 
saepe tantum scabridis ibique parum vel non clavellatis. Achaenia 
matura oblonga, compressa, brunneo-fusca- vel fusco-nigrescentia, 
3 — 4 mm longa, 2 — 2 1 /, mm lata, nitida, Bienne. Floret Julio — 
Septembri. 
Synonyma: 
Carduus altissimus L. Spie. pl. ed. 1, p. 824 (1753). — Beck, 
Bot. North Middle Stat., p. 172 (1833). — Darlingt. Fl. Ccstric., 
p. 439 (1837). — Porter in Mem. Torr. Bot. Club V, p. 344 (1893 — 94). 
— Rydberg, Fl. Nebrask. in Contrib. U. S. Nat. Herb. III, p. 167 
(1895). — Millsp. et Nutt., Fl. West. Virg., p. 233 (1896). — Britt. 
et Brown, Illustr. Fl. North U. S. III, p. 485, Fig. 4059 (1898). 
— Harper in Bull. Torr. Bot. Club XXVII., p. 327 (1900). — 
Britton, Man. Fl. North Stat. Canad., p. 1031 (1901). — Small, 
Fl. Southeast. U. S., p. 1307 (1903). 
