Eucephalus breweri (A. Gray) G.L. Nesom is native to open coniferous forests and subalpine meadows in the Sierra Nevada in California and adjacent Nevada (Allen 2006 FNA). The species is rayless and has subsequal phyllaries. The species is diploid (2n=18).
The species was first described as a goldenaster (Chrysopsis breweri A. Gray, Heterotheca breweri (A. Gray) Shinners). Semple (1988) was the first to recognize that it was a rayless aster, not a rayless goldenaster (Aster breweri (A. Gray) Semple).
Specimens at the northern edge of the range may intergrade with E. glabratus and E. tomentellus (Allen 2006 FNA).