Mimulus douglasii is a species of monkeyflower known by the common names brownies and purple mouse ears. It is native to the mountains and foothills of California and Oregon, where it is often found on serpentine soils. M. douglasii was first described in a published flora by George Bentham, an English botanist who was considered "the premier systematic botanist of the nineteenth century,." It was later described by Asa Gray, the father of North American botany.