E-Flora BC: Electronic Atlas of the Flora of British Columbia

There are many other species of Saxifraga that occur in the mountain of Vancouver Island, but most of the other species have white flowers, although some are greenish or tinged with purple. The petals of the white-flowered species are often notched at the tip and they have no marginal cillia; those of Micranthes tischii are not apically notched and usually have 1-7 asymetrically distributed marginal cillia. Though it looks as if M. tischii has no petals, the petals are always there but are semi-microscopic; a 10- power hand lens is extremely helpful in identifying this species.

Source: British Columbia Conservation Data Centre