448 Petrak, Die nordamerikanischen Arten der Gattung Cirsium. 
si-nuato-pinnatifida, laciniis triangulari- 
o vatis inaequaliter broviterque bi- vel tri- 
(1 c n t a t i s , margine spinuloso-ciliatis, s p i n i s i n f i r m i s 
vel subvalid is terminatis; folia caulina inferiora 
supra araclinoideo-canescentia, subtus albo-tomentosa basi semi- 
amplexicauli, sessilia, plus minusve, plerumque ad unant 
tertiam circitef decurrentia, alis paullatim a n - 
g u s t a t i s , spinoso-dentatis, ambitu lanceolata vel oblongo- 
lanceolata remote sinuato-pinnatifida, laciniis ambitu triangu- 
laribus vel triangulari-ovatis profunde spinoso-dentatis, dentibus 
triangularibus abruptiuscule acuminatis vel subobtusis, spinis 
subvalidis 2—5 mm longis terminatis; caulina mcdia et superiora 
gradatim minora, supra parce arachnoideo-canescentia vel fere 
glabrescentia, subtus plus minusve arachnoideo-tomentosa, ambitu 
lanceolata, remote sinuato-dentata, dentibus late triangularibus 
vel triangulari-ovatis inaequaliter denticulatis, spinis ad 6 mm 
longis subvalidis terminatis, ceterum ut folia caulina inferiora. 
Capitula in apice caulis et ramorum s o 1 i t a r i a vel raro 
2 — 3 subaggregata, breviter pedunculata, inferiora saepe sub- 
abortiva, ebracteata vel br acteis 1 — 2 lineari- 
b u s vel 1 i n_e ari-lanceolatis, spinuloso-ciliatis, 
m u 1 1 o brevioribus suffulta, basi parum dilatata, plus 
minusve excavata, ovato-globosa vel globosa, cum 
flosculis 20 — 26 mm longa, 18 — 22 mm lata. Involucri glabres- 
centis vel parcissime arachnoidei foliola ex- 
teriora et media e basi ovato-oblonga vel oblonga 
lineari - lanceolat a, paullatim attenuata, in 
spinas stramineas subvalidas exteriorum 
subrecurvatas, mediorum erecto-patentes, 
4 — 6 mm longas excurrentia, dorso subvis- 
cido-carinata; interiora et intima gradatim longiora, 
linear i-lanceolata vel linearia, apice erecto-patentia, 
plus minusve purpur ascentia, elongato-acu- 
m i n a t a , primum abrupte introrsum, deinde sursum curvata, 
vix rigida. Corollae purpureae limbps ad medium circiter 
fere aequaliter quinquefidus, laciniis angustissime linearibus 
abruptiuscule acuminatis vel subobtusis, apice parum incrassatis, 
a tubo vix vel satis distinctus eoque parum brevior vel subaequi- 
longus. Pappus sordide albus, setis plumosis, apice saepe tantum 
scabridis. Achaenia matura oblonga, compressa, fusca, 3 1 / 2 — 4 mm 
longa, 2 mm lata. Perenne. Floret Februario — Octobri. 
Synonyma: 
Cirsium Virginianum var. <?. Torr, et Gray, Flor. N. Amer. II, 
3, p. 458 (1843). — Grav, PI. Wright. I, p. 125 (1852); II, p. 101 
(1853). 
Cirsium Virginianum var. Gray in Torr. Rep. U. S. Mex. 
Bound. Surv. I, p. 103 (1859). 
Cirsium texanum Buckley in Proc. Acad. Nat. Sei. Philad. 
1861, p. 448 (1862). — Gray in Proc. Acad. Nat. Sei. Philad. 1862, 
p. 165. 
