Mimulus androsaceus is a species of monkeyflower known by the common name rockjasmine monkeyflower. It is endemic to California, where its distribution spans between the Coast Ranges north of the San Francisco Bay Area to the Mojave Desert, and the Transverse Ranges and Peninsular Ranges. It is endemic to California, where its distribution spans between the Coast Ranges north of the San Francisco Bay Area to the Mojave Desert, and the Transverse Ranges and Peninsular Ranges. It grows in moist or wet areas in many types of habitat. Mimulus androsaceus is a petite annual herb producing a hair-thin, erect stem just a few centimeters tall. Its herbage is mostly red to greenish in color, the paired tiny leaves sheathing the stem at midpoint. The tubular base of the flower is surrounded by a slightly hairy red calyx of sepals. The flower corolla is pink to reddish-purple with darker spots in the throat, and just a few millimeters long.