Classification of the genus Kyphophyllum
G. †Kyphophyllum Wedekind 1927
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†Kyphophyllum greggi Merriam 1972
†Kyphophyllum nevadensis Merriam 1973
†Kyphophyllum schmidti Kaljo 1958
Invalid names: Cyphophyllum Lang et al. 1940 [synonym]