LOL, I didn't even know there was a mini version of a Cereus but yeah I guess that would be considered a miniature since some do grow really tall. My C. repandus only grows (rather grew since we chopped it into 3 pieces) to @ 7 feet. It was in the ground when we bought this house a little over three years ago so I'm not sure how long it had been planted here. The former owner of the house was an elderly lady in her 80's who'd been here since 1983; neighbors told me the cactus had been here as long as they could remember so maybe mine is considered a mini too.
umm, as I said, I had no idea there were actually really small Cereus and I don't really like linking to this other site ... but when googling, this one that grows 6 to 12 inches in height popped up:
http://davesgarden.com/guides/...
