Accepted By:
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Christenhusz, M. J. M., J. L. Reveal, A. Farjon, M. F. Gardner, R. R. Mill & M. W. Chase. 2011. A new classification and linear sequence of extant gymnosperms. Phytotaxa 19: 55–70.
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Flora of North America Editorial Committee. 1993. Pteridophytes and Gymnosperms. 2: i–xvi, 1–475. In Flora of North America Editorial Committee (eds.) Fl. N. Amer.. Oxford University Press, New York.
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