2

We present deep, narrowband imaging of the spiral galaxy M101 and its group environment to search for star-forming dwarf galaxies and outlying HII regions. We find no large population of outlying HII regions or undiscovered star-forming dwarfs in the M101 Group, as most sources (93%) are consistent with being M101 outer-disk HII regions. The lack of any hidden population of low-luminosity star-forming dwarfs around M101 suggests a shallow faint-end slope (as flat at $\alpha ~ -1.0$) for the star-forming luminosity function in the M101 Group.