Cactus Flower

[BikerDoc5968]

I picked both of these up on a recent trip to one of my favorite greenhouses in
Florida. They had no tags but I loved the pattern on the barrel and just the curiosity of what the flowers would look like.... couldn't pass them up. I know the barrels look slightly different, I'd bet they are the same species. Problem is I have no name... not even a genus. If I had at least a genus I could research the species, since I doubt they are hybrids. How about some help here....

[Zoi2]

Very pretty!
I've had some luck in finding a few cactus here.
On-line Guide to the positive identification of Members of the Cactus Family
Joann