I agree it is a Micranthes (formerly included with Saxifrage), but believe it could be one of several west coast native species. My experience with this plant family is that the appearance can be very variable, making a confirmed ID tricky.

Artinnature, I assumed you were in eastern NA? The majority of Micranthes species are western.

This plant is growing in a friends shady garden in nearby Salem Oregon. She shared a piece with me and said it was some type of Saxifraga but didn't know the species.

Ive looked at all the western Micranthes species, and the only species that has pubescent leaves, like these rosettes is Micranthes californica.

Micranthes californica.

You guys still think this is Micranthes not Saxifraga? It's growing rapidly and developing flowers. All photos I can find of Micranthes show somewhat pointed leaves, or definitely narrowed towards the tip. None of them seem at all orbicular like my plant. Edit: M odontoloma is orbicular but otherwise doesn't look like my plant much at all, not hairy, deep sinus at petiole, hmm.

My best guess now is Saxifraga hirsuta. I think the winter look was deceptive :-))

It does look more like S. hirsuta, which is from Europe, and not recorded as being in Oregon, unless your friend ordered it? Otherwise I think it could be Saxifraga mertensiana. S. mertensiana does have hairy stems and leaves, but the majority of the photos of S. mertensiana that Ive looked at don't show the leaf pubescence, which might be why I dismissed it previously. It's the most common Saxifraga species in Oregon.

Jay, you do know we have a lot of non-native plants in our gardens? Not everything presented for an ID has to be something that occurs naturally. Area nurseries here are overflowing with plant exotica and Saxifragas in particular are big pass-along plants. I have several myself that were gifted to me by other gardeners.

It really does look like S. hirsuta more than anything else. Thanks you two:)

The gardener who gave me the division is an officer for the Salem Hardy Plant Society. So, yeah, she has a lot of non-native plants from all over the world in her garden.