Mertens's Saxifrage - Saxifraga mertensiana
Uncommon, found in crevices on moist cliffs and rocky banks (not along streams, as are the other two round-leaf saxifrages), reaching 6000 feet. The petals are white, but, as shown here, the flowers are sometimes replaced by small plantlets. Photographed near Silver Falls on June 18, 2015.