Brian, N.J.; Hodgson, W.C.; Phillips, A.M. 1999. Additions to the flora of the Grand Canyon region. II. Journal of the Arizona-Nevada Academy of Science. 32(2): 117-127.

Brian, N.J.; Hodgson, W.C.; Phillips, A.M. 1999. Additions to the flora of the Grand Canyon region. II. Journal of the Arizona-Nevada Academy of Science. 32(2): 117-127.

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