Monardella breweri is a species of flowering plant in the mint family known by the common names Mustang Mint or Brewer's monardella.
M. breweri is endemic to California, where its range extends from the San Francisco Bay Area through the Central Coast Ranges to the Transverse Ranges, including the Santa Monica Mountains, in the Greater Los Angeles area and south to San Diego county. Its habitat includes chaparral and oak woodland.
It is a hairy annual herb producing a branching erect stem up to about 65 centimeters in maximum height. The oppositely arranged oval leaves are up to 4.5 centimeters long. The inflorescence is a head of several flowers blooming in a cup of stiff, pointed, veined, purplish bracts up to 3 centimeters wide. Each hairy pinkish five-lobed flower is just over a centimeter long.