454 Petrak, Die nordamerikanischen Arten der Gattung Cirsium. 
47. Cirsium montigenum. 
Radix mihi ignota. Caulis erectus, certe ad 2 m altus, glab- 
resccns vel parcissime arachnoideus, sulcato-striatus plus 
minusve purpurascens, remote foliosus, a 
jnedio circiter valde ramosus, ramis plus 
minusve elongatis, remote foliosis apice 
polycephalis. Folia radicalia supra glabrescentia 
vel parcissime arachnoidea, subtus arach- 
noideo-canescentia in petiolum elongatum, angustissime 
alatum remote spinoso-dentatum paullatim attenuata, a m b i t u 
late oblonga vel o b 1 o n g o - e 1 1 i p t i c a , alte si- 
nuato-pinnatifida, laciniis latis, trinervi- 
bus, inaequaliter 2 — 4 dentatis, dentibus 
lanceolatis vel lanceolato-triangularibus, 
paullatim attenuatis, subobtusis vel ab- 
rupt i u s c u 1 e acuminatis, m a r g i n e spinuloso-cili- 
atis, spinis stramineis 3 — 5 mm longis sub- 
validis terminatis; caulina inferiora utrinquc 
glabrescentia vel subtus tantum parce 
arachnoidea, basin versus plus minusve attenuata, semi- 
amplexicaulia sessilia, breviter — ad 1 cm — decur- 
rentia, alis latis profunde spinoso-dentatis, 
ambitu oblongo-lanceolata, alte sinuato-pinnatifida, laciniis ad 
medium circiter inaequaliter bi- vel trifida, lobis anguste lan- 
ceolatis vel lineari-lanceolatis paullatim acuminatis, ceterum foliis 
radicalibus similia; caulina superiora gradatim minora, utrinquc 
glabrescentia vel subtus tantum parcissime arachnoidea, basi late 
semiauriculato-semiamplexicauli sessilia, breviter decurrentia, am- 
bitu e basi late ovato-oblonga lanceolata, sinuato-pinnatifida, 
spinis validioribus nec non crebrioribus armata, ceterum ut folia 
caulina inferiora. 
Capitula in apice caulis et ramorum 2 — 6 plus minusve 
aggregata, subsessilia vel breviter pedun- 
culata, praeterea in axillis foliorum sup- 
remorum capitula 2 — 4 breviter pedunculata 
quasi racemose disposita, bracteis 1 — 3 pa- 
rum brevioribus vel subaequilongis, ambitu 
lanceolatis, remote s i n u a t o - d e n t a t i s , den- 
tibus ad spinas fere omnino reductis suf- 
ful t a , ovata vel ovato-globosa, cum flosculis 
25 — 32 mm longa, 16—26 mm lata, basi parum dilatata plus 
minusve excavata. Involucri glabrescentis vel par- 
cissime arachnoidei foliola exteriora et media e basi 
ovato-oblonga paullatim acuminata, dorso 
non vel pef parum viscido-carinata, apice 
erecto- vel plus minusve recurvo-patentia, 
spinulis subvalidis 1 — 2 mm longis strami- 
neis terminata, interiora gradatim scd parum longiora, 
intima lineari-lanceolata, elongato-acuminata, dorso plus 
minusve purpurascentia, apice subscariosa, 
