Description: Perennial shrub, densely branched, 10 - 60 cm (to 23.6 in.) tall. Stems smooth, glabrous, swollen at nodes. Leaves alternate, round to spatula shaped, to 17 mm (0.7 in.) long, hairy on one or both sides. Inflorescence a raceme, cushion-like and open. Flower sepals 1.5 mm long, white; petals lacking. Fruit an achene, 2.5 mm (0.1 in.) long. Time of flowering: June to September.
Habitat: Limestone outcrops, talus, scree, and gravelly washes and banks, in creosote, saltbush, and blackbrush communities. Elevations: 1,219 - 1,829 m (4,000 - 6,000 ft).
Range: Southern Nevada endemic, in Clark and Nye counties. Known from the Spring Mountains and Sheep Range.
Comments: Diagnostic features for var. clokeyi include a racemose inflorescence versus dichotomously branched (forked inflorescence); also lower flowers bloom first versus the terminal flowers first.