We have a spineless cactus that we planted about thirty years ago in the Southern Arizona desert, purchased as, and appearing to be, Cereus peruvianus monstrose. It has been neglected but the tallest shoot is now ~4m tall, and the past several years it has attempted to bloom.
The flowers make no sense for a Cereoid cactus: there are only a few tepals, the flowers never open, they vaguely appear bilabiate (but that may be an illusion), and the buds are chokingly dense. We've not been able to find any pictures on the web of anything like this. The flowers are too high to pick one to dissect it.
Any ideas? Do you know of a more specialist forum where this question might be asked?
