Anne Elliott's photos with the keyword: Spiny-leaved Sow Thistle?

Saw these wildflowers on 29 September 2014, growing at the Hoodoos Trail near Drumheller, in the Badlands of Alberta. They reminded me of Dandelions and then of Sow Thistles, but the leaves just weren't right. I think Art (LeapFrog) has the right ID - Spiny-leaved Sow Thistle.