An alpine Saxifrage

Photographed this small Saxifrage at the side of the Ptarmigan Cirque Trail (in Kananaskis) last weekend. I'm not sure what species of Saxifrage it is - can anyone help me with the correct ID? I love all the exquisite detail of each individual flower! Just wondering if it is Leather-leaved Saxifrage (Leptarrhena pyrifolia). On the other hand, MountainNature.com says about Western Saxifrage:

"The flowers form in several tight clusters of small, white flowers. The lack of leaves along the stem, and its fuzzy nature, distinguishes it from the leather-leaved saxifrage."

Note later: apparently, it is a Diamond-leaved Saxifrage, also called Snowball Saxifrage (Saxifrage rhomboides) .