Accepted By:
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Hitchcock, A. S. 1951. Man. Grasses U.S. (ed. 2) 1–1051. U.S. Department of Agriculture, Washington, D.C.
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Munz, P. A. & D. D. Keck. 1959. Cal. Fl. 1–1681. University of California Press, Berkeley.
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Scoggan, H. J. 1978 [1979]. Pteridophyta, Gymnospermae, Monocotyledoneae. 2: 93–545. In Fl. Canada. National Museums of Canada, Ottawa.
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