Cirsium cymosum var. canovirens   gray-green thistle
           (Alt: Cirsium canovirens )
Asteraceae (Alt: Compositae )
native                      herbaceous           
Distribution: Oregon Trail, Foothills, West Valley, South Boise, Lucky Peak

USDA Plants Link: Cirsium cymosum var. canovirens   (CICY)
Flora of North America Link: Cirsium cymosum var. canovirens

Basal rosettes of young plants have less deeply toothed leaves than older ones.  Plants can spend several years building up reserves before blooming and then dying (the fate of monocarpic perennials).