Lepidium ostleri (Ostler’s peppergrass) is a long-lived perennial herb in the mustard family (Brassicaceae). For the purposes of this document, we will refer to Lepidium ostleri as “Ostler’s peppergrass.” It grows in dense cushion-like tufts up to 2 inches (in.) (5 centimeters (cm)) tall (Welsh et al. 2008, p. 328). The grayish-green hairy leaves are 0.16 to 0.59 in. (4 to 15 millimeters (mm)) long, generally linear, and entire or with lobed basal leaves (Welsh et al. 2008). Flowering stalks are approximately 0.39 in. (1 cm) long with 5 to 35 flowers that are white or have a purple tint (Welsh et al. 2008).