| (1631-2) Acanthocalycium violaceum Backeb. Kaktus-ABC [Backeb. & Knuth] 1936 (1935; 12 Feb 1936)
(128765-1) Acanthocalycium violaceum Backeb. Kaktus-ABC [Backeb. & Knuth] 1936 [12 Feb 1936]
__ The Plant Names Project (1999). International Plant Names Index. Published on the Internet; http://www.ipni.org [01 January 1970]
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