Description: Perennial herb, 15 - 30 cm (5.9 - 11.8 in.) tall, distinctively pale in color. Stem base generally buried in sand, stems glabrous. Leaves to 3 cm (1.2 in.) long, opposite, entire, spatulate to ovate shaped, with conspicuously callous-like white margins. Inflorescence a raceme with several flowers, glabrous. Flower sepal lobes with callous-like white margins; petals 1.2 - 1.8 cm (0.5 - 0.7 in.) long, lavender-pink with purple guidelines. Fruit a capsule. Time of flowering: March to May.
Habitat: Mojave Desert scrub, and to a lesser extent blackbrush community. Occurs on sand deposits on the leeward side of dry lakebeds, in flat wash bottoms of outwash canyons and occasionally on slopes above them. This species is dependent upon the maintenance of the sand transport system from dry lakebeds towards lower slopes. Elevations: 460 - 1,100 m (1,500 - 3,600 ft).
Range: East Mojave Desert endemic with one population in California, one in Arizona and in Nevada. In Clark County, known from Hidden Valley, Jean Lake, and Jean; also in Nye County.
Comments: This species is easily identified with its white-margined leaves and sepals.