Accepted By:
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Blake, S. F. 1922. New plants from South America and Central America collected by Wilson Popenoe. Proc. Biol. Soc. Washington 35: 117–121.
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Jørgensen, P. M. & C. Ulloa Ulloa. 1994. Seed plants of the high Andes of Ecuador—A checklist. AAU Rep. 34: 1–443.
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Smith, A. C. 1933. The genera Sphyrospermum and Disterigma. Brittonia 1(4): 203–232.
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