Rhodiola integrifolia is a beautiful and perhaps somewhat underappreciated hardy succulent.
Here's the native range from the USDA Plants site (scroll down to see that of the subspecies):
http://plants.usda.gov/java/profile?symbol=RHIN11
The subspecies that occurs here is R. integrifolia ssp. integrifolia and it's common in habitat on alpine ridges and scree, both wet and dry.
1) I see plants with entire leaves most often in the areas where we hike.
2) Here's a little colony of toothed-leaved plants in the same area as above.
3) And a "rare" (according to Flora of Alberta) yellow-flowered form in the same area again.
4, 5) As part of little alpine gardens in the wild. (Wish I could pick these up and take them home!)
6) Showing brilliant colour after a frost.
