252 P e t r a k , Die nordamerikanischen Arten der Gattung Cirsium. 
gato-acuminata, apiccm versus stramineo- 
in argin ata subscariosa ibique spinuloso- 
fimbriata. Corollae limbus ad medium cir- 
citer inaequaliter quinquef idus, a tubo vix 
vel satis distinctus eoque parum brevior 
vel subaequilongus. 
1. Cirsium maritimum. Omnino densissime albo- 
tomentosum. Caulis humilis, simplex vel apice tantum 
breviter ramosus. Folia non vel brevissime decurrentia. 
III. Dermatolepis. 
Folia supra papilloso-pilosa, subtus 
arachnoideo-canescentia. Involucri glabres- 
centis foliola exteriora et media subcoria- 
cea, e basi late ovata a medio circiter in 
appendicem erecto-vel plus minusve r e - 
curvo-patentem, late ovatam, paullatim 
acuminatam plus minusve purpurascentem, 
spinis subvalidis 2 — 3 mm longis termina- 
tam dilatata, intim a parum longiora, recta, 
lineari-lanceolat a, apice spathulato-dila- 
tata, abruptiuscule acuminata, margine 
eroso-denticulata, subscariosa. Corollae 
limbus vix ad medium inaequaliter quin- 
quefidus, a tubo satis distinctus eoque fere 
duplo brevior. 
1. Cirsium fontinale. Caulis subhumilis, simplex vel apice 
plus minusve ramosus. Folia breviter decurrentia. 
IV. Sect. Echenais. 
Cass. Bull, philom. 1818, p. 33 et 1820, p. 4 sub gen. 
Folia utrinque plus minusve arachnoidea 
vel fere glabrescentia. Capitula mediocria 
vel parva ovata vel ovato-globosa, brac- 
teata vel subebracteatä. Involucri glabres- 
centis vel parce arachnoidei foliola vel 
omnia apicem versus scariosa, margine plus 
minusve fimbriato-ciliata, vel exteriora 
subfoliacea virescentia, margine integer- 
rima vel plus minusve, saepe fere pectinato- 
spinulosa, interiora et intima parum lon- 
giora, apice tantum plus minusve scrarioso- 
appendiculata ibique eroso-denticulata vel 
fimbriata. Corollae limbus plerumque ad 
medium circiter inaequaliter quinquef idus, 
a tubo vix vel satis distinctus eoque parum 
longior vel subaequilongus. 
