Publication: N. Amer. Fl. 22: 137. 1905.
selected vouchers: WTU
Notes: FNA8: "Micranthes fragosa is restored to specific status here because a review of its differences with M. nidifica shows it to be more distinctive than previously thought, and for consistency in the application of criteria for species recognition within the rest of the genus. In the southernmost part of its range, M. fragosa converges in appearance with M. californica."