Saxifraga trifurcata Schrad.

Evergreen perennial herb forming large cushions. Leaves stiff, kidney-shaped to about 2 cm wide, with 3 primary, toothed, palmate divisions sometimes further divided, stalks long. Flowers on branched stems to over 20 cm long, each about 2 cm wide, petals white.

Pyrenees.

Source: Spencer, R. (2002). Saxifragaceae. In: Spencer, R.. Horticultural Flora of South-eastern Australia. Volume 3. Flowering plants. Dicotyledons. Part 2. The identification of garden and cultivated plants. University of New South Wales Press.

kingdom Plantae
phylum   Tracheophyta
class    Magnoliopsida
superorder     [Saxifraganae]
order      Saxifragales
family       Saxifragaceae
genus        Saxifraga L.