Description: Biennial or short-lived perennial herb, to 40 cm (15.7 in.) tall. Stems 1 to 2, with appressed hairs and bristles. Leaves mostly basal, to 3 cm (1.2 in) long, spatula-shaped, covered with appressed spreading bristles. Inflorescence elongate, open, weakly bristly, crowded with flowers. Flower sepals to 9 mm (0.3 in.) long; petals white, with a corolla tube 3 - 4 mm (0.16 in.) long. Fruit 1 - 4 nutlets (one-seeded segments), 4 mm (0.16 in.) long, distinctly keeled on the outer face, with short tubercles (wart-like projections). Time of flowering: April to June.
Habitat: Presumed to occur on light-colored alkaline clay flats and low hills in creosote bush community. Elevations: 579 - 610 m (1,900 - 2,000 ft).
Range: Clark County, Nevada. Known only from the Las Vegas Valley.
Comments: This species is likely extirpated due to urban expansion in the Las Vegas Valley. Last known collection was in 1942. Requires mature fruit for identification.
Special Remarks: This is a State of Nevada Critically Endangered Species.