The words “ hybrid Epiphyllum ”, which I used to use, are a misuse of language of which you should be aware:
“Epiphyllum” is a genus of botanical epiphytic cacti. “Hybrid Epiphyllum” only makes sense when two or more Epiphyllum are crossed.
But, as it happens, in the pedigree of a hybrid Epiphyllum, we sometimes find several genera: Epiphyllum, Disocactus, Selenicereus, Heliocereus, Hylocereus, and so on. The pedigree of a hybrid Epiphyllum may even contain no Epiphyllum at all, which becomes nonsense.
'Frühlingsanfang', for example, has Disocactus macranthus x Disocactus nelsonii as its pedigree.
Some authors refer to Epicactus instead of hybrid Epiphyllum. As of today, I've decided to adopt this point of view, giving the word Epicactus the following definition:
Epicactus: any hybrid epiphytic cactus whose pedigree contains only botanical species of the tribe Hylocereeae, as well as crosses of these species.
Schlumbergera and Rhipsalidopsis are not members of the tribe Hylocereeae. Their hybrids are therefore not Epicactus.
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