Epiphyllum biforme (Lindl.) Don = Disocactus biformis (Lindl.) Lindl.
English:
biformis,-is,-e;

https://archive.org/stream/#page/1378/mode/2up
homotypic synonyms:
Cereus biformis Lindl.; Disocactus biformis (Lindl.) Lindl.; Epiphyllum biformis (Lindl.) G. Don; Phyllocactus biformis (Lindl.) Labour.;

protologue: Encycl. Pl. (new ed., 1855) 1378: 1378 (1855)

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