Wildflowers: Is this ranunculus eschscholtzii?

I noticed many of these flowers on an alpine hike in the Lake O'Hara area in Yoho National Park. From what I can determine, it had six petals. I assume that it is some kind of ranunculus, but I am having difficulty matching the leaves and flower colour to a particular species. Could this be a white ranunculus eschscholtzii, alpine buttercup? Thanks for your help.

 

Anemone sp.?

I don't see any sepals behind/between the petals, which Ranunculus species do have.

 

It's Anemone lithophila.

Edit: For next time, Ranunculus eschscholtzii has yellow flowers, as do many of the native Ranunculus here. Among native Anemone, only Anemone richardsonii has yellow flowers.

 

Thank you for your sharing your knowledge and insight!