Regarding the identification. The flower is a dead-ringer for the E. pachanoi, though the cactus in question is not E. pachanoi (I have one of those growing next to it and the body is completely wrong). The body of the plant resembles the Pipe Organ cactus, but the flower has a different form and no coloration. I'm going to guess that it is a close relative of the Pipe Organ Cactus. Thanks Ross.
Additional information: the flower has no scent, it flowered at night, but has remained open during the day.
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