56 Muhlenbergia, Volume 9 
noid woolly: heads medium in size, 15 to 20mm. wide, 25mm. 
high: bracts somewhat woolly pubescent, especially on the 
edges, glandular ridged, in about 5 series, the two innerimost 
series innocuous, but much prolonged into slender curled tips, 
the others armed with long, slender spines: flowers whitish: pap- 
pus white, about 2cm. long, plumose. 
Collected near the banks of the North Fork of the Gunni- 
son river at Paonia, Delta county, Colorado, July 23, rgII, no. 
g612. This Carduus is remarkable for its stout spines, and I 
know of no species in Colorado which equals it in this respect. 
Its relationship is probably with C. ochrocentrus (Gray) Greene, 
but the spines are even stouter than they are in that species, the 
divisions of the leaves are fewer, it is more branched, and the 
heads are much smaller. 
Windsor, Colorado. 
