Ericameria nauseosa (formerly Chrysothamnus nauseosus), commonly known as chamisa, rubber rabbitbrush, and gray rabbitbrush, is a shrub in the sunflower family (Aster) found in the arid regions of western North America.

Two subspecies have been described, consimilis (the green form with 8 varieties) and nauseosa (the gray form with 14 varieties).

Ericameria nauseosa is a perennial shrub growing to 2 to 8 metres (6+1⁄2 to 26 feet). The leaves, depending on the subspecies, are 2–7.5 centimetres (3⁄4–3 inches) long and narrow to spatula-shaped. Both the flexible (rubbery) stems and the leaves are greenish-gray with a soft felt-like covering.

It blooms from August to October and produces pungent-smelling, golden-yellow flowers. The flower heads are 6–13 millimetres (1⁄4–1⁄2 in) long and made up of 5 small, yellow, tubular disk flowers, and occur in umbrella-shaped terminal clusters. The shrub reproduces from seeds and root sprouts.

Rubber rabbitbrush was moved from the genus Chrysothamnus to the genus Ericameria in a 1993 paper. The findings of a 2003 phylogenetic investigation of Ericameria were consistent with the move of the species to Ericameria. The second edition of the Jepson plant manual and the United States Department of Agriculture's Germplasm Resources Information Network have adopted the name Ericameria nauseosa.

The specific epithet means 'heavy scented'.

Recognized infraspecific taxa from The Plant List with distribution information from Flora of North America and Tropicos:

It grows in the arid regions of western Canada, western United States (from the western Great Plains to the Pacific) and northern Mexico.