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ID one of the jungle cacti...

last month

I received it as Pfeiffera monacantha, but the "segments" are round, not flat as I see in photos of that species. Is it even a Pfeiffera? I have no idea! The segments are 5-sided, though they simply look round until you look carefully or feel them. About the size of a pencil. They tend to get aerial roots, though I trim them off. Here's a photo:

I appreciate any help you can offer!

Denise in Omaha