P e t r a k , Die nordamerikanischen Arten der Gattung Cirsium. 505 
tibus triangulari-lanceolatis acuminatis, 
spinis infirmis 2 — 3 mm longis stramineis 
terminatis, nunc alte et remote sinuato- 
pinnatifida, laciniis ad basin fere bifidis, 
lobis d i v e r g e n t i b u s , 1 i n e a r i - 1 a n c e o 1 a t i s , 
paullatim acuminatis m argine breviter spi- 
nuloso-denticulatis spinuloso-ciliatis ; caulina inferiora 
basi parum angustata semiamplexicauli sessilia, bre vissime 
decurrentia, supra parce arachnoidea vel glabrescentia, 
subtus albo-tomentosa, ambitu anguste lanceolata vel lineari- 
lanceolata, ad medium circiter valde remote sinuato-lobata, lobis 
triangulari-ovatis, basi breviter bidentatis, margine spinuloso- 
ciliatis, obtusiusculis, spinis stramineis infirmis vel subvalidis, 
2 — 5 mm longis terminatis; caulina superiora gradatim minora, 
suprema linearia, utrinque dentibus 1 — 2 triangularibus acuminatis, 
spinis subvalidis 3 — 6 mm longis terminatis. 
Capitula in apice caulis et ramorum solitaria, brac- 
teis 1 — 2 anguste linearibus, margine spinu- 
loso-ciliatis, multo brevioribus suffulta, 
ovata vel oblongo-cylindrica, cum flosculis 
25 — 40 mm longa, 10 — 20 mm lata, basi parum dilatata et ex- 
cavata. Involucri parcissime arachnoidei foliola 
exteriora et media ovato-oblonga, paullum supra 
medium abrupte in spinas stramineas sub- 
validas erecto-patentes 1 — 6 mm longas ex- 
currentia, interiora gradatim longiora, intima lineari-lan- 
ceolata paullatim acuminata nec spinosa, apicem versus 
plus minusve purpurascentia subscariosa, undulato- 
curvata. Corollae purpureae, raro roseae vel albidae 1 i m b u s 
plus quam ad duas tertias fere aequaliter 
q u i n q u e f i d u s , laciniis a n g u s t i s s i m i s line- 
aribus acuminatis, atubovixvel satis dis- 
tinctus eoque parum vel subduplo brevior. 
Filamenta parce breviterque papilloso-pilosa. Pappus sordide 
albus flosculorum exteriorum setis paucis omnino scabridis nec 
plumosis, interiorum plumosis apice tantum scabridis ibique 
saepe parum clavellatis. Achaenia matura oblonga, compressa 
nitida, pallide canescentia vel brunnea, 6 — 7 mm longa, 3 — mm 
lata. Perenne ? Floret Augusto — Octobri. 
Synonyma: 
Cirsium floccosum Petrak, Cirsiotheca univ. Nr. 20 nec Rydb. 
in Bull. Torr. Bot. Club XXXII, p. 133 (1905). 
Distributio: In lapidosis saxosis apricis in montibus 
Arizonicis meridionali-orientalibus dispersum. 
V i d i # e locis sequentibus: 
Arizona: In declivibus ad orientem spectantibus montium 
Rincon Mountains loco dicto Spud Ranch ca. 2200 m, solo schistoso, 
19. X. 1910 Coli. J. C. Blumer H. P. — Chiricahua Mountains: 
Barfoot Park; rolling, andesic, pine land, recentlv lumbered 
alt. 2400—2500 m, 18. IX. 1906 Coli. J. C. Blumer Nr“. 1395 H. P. 
