The name can not be typified. It COULD be an juvenil form of any Central American Hylocereus. But the type is a five angled plant and flowers are unknown. The name is best discarded. Usually plants with this name belong to H. monacanthus or H. costaricensis. I would say the two photos of your is H. monacanthus and Matt Cheney's photo is H. costaricensis.
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