I have no idea what these potentillas are, but just thought I'd mention that
P. hyparctica is one of the alpine potentillas that occurs here, and
Flora of Alberta says the inflorescence may be one- or two-flowered.
Let alone suggest what the potentillas in question may be, I remain baffled as to how the various alpine potentillas that occur here are distinguished, and so I bought one at the local rock garden society plant sale last year, and grew another from seed, hoping to discern the differences as described in
Flora of Alberta...
So, assuming whoever grew them or collected the seed actually knows the differences, the following species may be a couple more possibilities to consider for the potentillas in question here!
Or maybe for Helen's anyway, as these two don't form leafy stems.
P. nivea (a tighter plant but how much of that might be conditions?):
P. uniflora: