490 
Petrak, Die nordamerikanischen Arten der Gattung Cirsium. 
vel lanceolato-oblonga, remote sinuato- 
dentata, dentibus late ovato-triangularibus inaequaliter bi- 
vel tridentatis subobtusis, spinis infirmis vel subvalidis stramineis 
1 — 6 mm longis terminatis, spinuloso-ciliatis; caulina superiora 
et suprema gradatim minora lineari-lanceolata vel 
lanceolata, paullatim attenuata, remote 
breviterque dentata vel sinuato-lobata, 
lobis late triangulari-ovatis ad medium fere inaequaliter bi- vel 
trifidis, dentibus triangularibus acuminatis, spinulis infirmis vel 
subvalidis stramineis 1 — 7 mm longis terminatis, ceterum foliis 
inferioribus simillima. 
Capitula in apice caulis et ramorum solitaria vel 
saepe 2 — 5 racemose disposita, breviter pe- 
dunculata vel subsessilia, ebracteata vel 
bracteis 1 — 2 multo minoribus, lineari-lan- 
ceolatis, pectinato-spinulosis suffulta, basi 
excavata, vix dilatata, magna vel maxima, globosa 
vel ovato-globosa, cum flosculis 4 — cm longa, 
3 — 6 cm lata, basi vix vel parum dilatata et excavata. Involucri 
dense vel densissime arachnoideo-lanugi- 
n o s i foliola omnia subaequilonga, exteriora et media e basi 
ovato-oblonga elongato-acuminata, ad duas 
tertias circiter erecto- vel subrecurvo-pa- 
tentia, rigida, plus minusve purpurascen- 
tia, paullatim in spinas brunneo-stramineas 
2 — 6 mm longas validas excurrentia, dorso 
subcarinata; interiora et intima flosculis parum 
longiora vel subaequilonga, raro fere breviora, 
linearia vel lanceolato-linearia, elongato-acuminata 
apice saepe plus minusve purpurascentia nec 
rigida, nec scariosa. Corollae purpureae vel lilacinae, raro albidae 
limbus parum plus quam ad medium inaequaliter quinquefidus, 
laciniis angustissimis linearibus acuminatis, a tubo vix vel satis 
distinctus eoque parum brevior vel subaequilongus. Filamenta 
basin versus glabrescentia, a medio apicem versus subdense 
papilloso-pilosa. Pappus sordide albus flosculis parum brevior, 
setis plumosis apice saepe tantum scabridis, vix clavellatis. Achae- 
nia matura oblonga compressa, fusca vel nigrescentia, 5 — 6 mm 
longa, 2 1 / 2 — 3 mm lata, nitida. Bienne. Floret Aprilio — Julio. 
Synonyma: 
Carduus occidentalis Nutt. in Trans. Amer. Phil. Soc VII, 
p. 418 (1841). — Torr, et Gray, Fl. N. Amer. II, 3, p. 402 (1843). 
— Greene in Proc. Acad. Nat. Sei. Philad. 1892, p. 358 (1893). 
— Coville in Contrib. U. S. Nat. Herb. IV, p. 142 (1893). — Hall, 
Comp. South. Calif. in Univ. Calif. Public. Bot. III, 1, p. 239 (1907). 
Cirsium Coulteri Harv. et Gray in Gray, PI. Fendi., p. 110 
in adnot. (1849). — Walp., Ann. Bot. II, p. 944 (1851 — 52). — 
Gray ap. Torr, in Rep. U. S. Mexic. Bound. Surv. I, p. 103 (1859). 
— Eaton in U. S. Geol. Expl. Fort. Parall. CI. King V. Bot., 
p. 195 (1871). 
