Boechera microphylla sensu stricto is accepted for BC in the Flora North America. Probably limited in BC to the Okanagan, maybe north to the Fraser Canyon in the Chilcotin. It's a species of rock crevices, usually at low elevations.
Source: British Columbia Conservation Data Centre notes.
The table below shows the species-specific information calculated from original data (BEC database) provided by the BC Ministry of Forests and Range. (Updated August, 2013)