Accepted By:
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Cronquist, A. J. 1994. Asterales. 5: 1–496. In A. J. Cronquist, A. H. Holmgren, N. H. Holmgren, J. L. Reveal & P. K. Holmgren (eds.) Intermount. Fl.. Hafner Pub. Co., New York.
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Hickman, J. C. 1993. The Jepson Manual: Higher Plants of California 1–1400. University of California Press, Berkeley.
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Turner, B. L. 1987. Taxonomic study of Machaeranthera section Machaeranthera and Hesperastrum (Asteraceae). Phytologia 62: 207–266.
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