The following bibliography has been generated by bringing together all references provided by our content partners. There may be duplication.
- Das Pflanzenreich IV. 101 (Heft 49): 36. 1911. (Pflanzenr.)
- Hunt, David. 2006. The New Cactus Lexicon: Text. x + 373
- Journal of the New York Botanical Garden 9(107): 187–188, f. 32, pl. 48–52. 1908. (J. New York Bot. Gard.)
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