Semple (B.L.Rob. & Greenm.) No year - Semple JC, Leeder C, Leuty C, Gray L (1988) Heterotheca sect. Ammodia (Compositae: Astereae): A Multivariate Study of H. oregona and Specimens of Brewer's (Golden)aster. Systematic Botany 13: 547-558. doi: 10.2307/2419200.
There is no corrections for Heterotheca brandegei yet.