The form of Eriogonum umbellatum that occurs in Alberta is var. subalpinum, which differs from var. umbellatum, the variety that occurs in closest geographic proximity, most prominently by its flower colour - pale yellow or greenish white, tinged with rose as it dries, as opposed to the bright yellow of the latter.
http://linnet.geog.ubc.ca/Atlas/Atlas.aspx?sciname=Eriogonum%20umbellatu...
http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250060559
Here are some photos of it from montane elevations in northern Banff N. P., Alberta, blooming in mid-August in the aftermath of a high snowfall winter:
The compound umbel, subtended by leafy bracts that are often reflexed, is distinctive.
