| Noun | 1. | genus Chrysothamnus - genus of low branching shrubs of western North Americaasterid dicot genus - genus of more or less advanced dicotyledonous herbs and some trees and shrubs aster family, Asteraceae, Compositae, family Asteraceae, family Compositae - plants with heads composed of many florets: aster; daisy; dandelion; goldenrod; marigold; lettuces; ragweed; sunflower; thistle; zinnia goldenbush - any of various much-branched yellow-flowered shrubs of the genus Chrysothamnus; western North America Chrysothamnus nauseosus, rabbit brush, rabbit bush - pleasantly aromatic shrub having erect slender flexible hairy branches and dense clusters of small yellow flowers covering vast areas of western alkali plains and affording a retreat for jackrabbits; source of a yellow dye used by the Navajo |