This is a pretty member of the Mustard Family (Brassicaceae), one of the numerous Arabis species. Fortunately, the closely clasping leaves make it rather easy to identify as Shockley's rockcress (Arabis shockleyi). Arabis is undergoing a name change to Boechera, but the USDA Plants Database still has it as Arabis, and for the purposes of this blog, that's my source for official names.
Shockley's rockcress is only found in California, Nevada, and Utah. It grows in pinyon-juniper areas and blooms in April-May.
For more info about Shockley's rockcress, click here.
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