10-250 cm. Stems
erect or ascending to spreading, white to green, fastigiately branched, tomentose. Leaves
(usually crowded) usually ascending to spreading; blades filiform to narrowly oblanceolate (mostly adaxially sulcate to concave), 10-70 × 0.3-10 mm, midnerves mostly evident, apices acute, faces glabrous or tomentose, often gland-dotted (lacking well-defined circular pits) ;
axillary fascicles absent. Heads
in rounded to flat-topped, cymiform arrays (to 12 cm wide). Peduncles
1-20 mm (bracts usually 0, sometimes 1-5, reduced, scalelike). Involucres
obconic to subcylindric, 6-16 × 2-4 mm. Phyllaries
10-31 in 3-5 series (often in vertical ranks), tan, ovate to lanceolate, 1.5-14 × 0.7-1.5 mm, strongly unequal, mostly chartaceous (mostly keeled), midnerves raised for nearly entire lengths, expanded apically, apices acute to obtuse, abaxial faces resinous. Ray florets
0. Disc florets
(4-)5(-6); corollas 6-12 mm. Cypselae
tan, turbinate to cylindric or oblanceoloid, 3-8 mm, glabrous or hairy (often ± pilose or sericeous); pappi
whitish, 3-13 mm. 2n
= 18. Ericameria nauseosa
is widespread, often abundant, and complex. This treatment is based largely on that by L. C. Anderson (1986b). Uncertainty about the specimen used by Pursh to establish E. nauseosa
(as Chrysocoma nauseosa
) is a possible source of confusion concerning the application of that name (which is in current use) and of the name Chrysothamnus speciosus
Nuttall (J. L. Reveal et al. 1999). Anderson divided the species into two informal groups, the 'green forms' and the 'gray forms.' These two groups were formalized as subspp. nauseosa
by G. L. Nesom and G. I. Baird (1993), each containing varieties. Ericameria nauseosa
is reported to hybridize with other species in the genus, and hybrid and formula names have been applied to them. Their synonymies were more fully summarized by Nesom and Baird.
Ericameria ×bolanderi (A. Gray) G. L. Nesom & G. I. Baird, based on Linosyris bolanderi A. Gray is the hybrid between E. discoidea and E. nauseosa (L. C. Anderson and J. L. Reveal 1966).
Ericameria ×uintahensis (L. C. Anderson) G. L. Nesom & G. I. Baird, 'Uinta rubber rabbitbrush,' based on Chrysothamnus nauseosus subsp. uintahensis L. C. Anderson, is the hybrid between E. nauseosa and E. parryi (L. C. Anderson 1984).
Ericameria ×viscosa (D. D. Keck) G. L. Nesom & G. I. Baird, based on Chrysothamnus nauseosus subsp. viscosus D. D. Keck, is the hybrid between E. cuneata and E. nauseosa (L. C. Anderson 1986b).