DaisyI said:Why do you think they are all Opuntia ficus-indica?
Daisyl said:The Opuntia in photo #2 looks a lot like this one posted by @Wildbloomers yesterday. See it? Right side center.
Wildbloomers said:@deadbilly. The cactus that @DaisyI referenced is Nopalea cochenillifera. It is relatively common here in Florida and as others have mentioned you will be certain when it flowers as the flowers are distinctive. They are red on this plant and don't open much, likely ant or hummingbird pollinated. The pics in this database show the flowers clearly. I believe that she is correct, the second of your pictures appears to be the same as the ones I have. Although the plants appear similar in your pictures the first one looks like O. ficus-indica to me also quite common here in Florida.
This site uses The Catalogue of Life as the authority in naming and it states that Opuntia cochenillifera is a synonym of Nopalea cochenillifera.
When your plants flower be sure to look at the genus Consolea as well, as they are also found here and are similar looking.
You are correct that your plants are not any of the common low growing Opuntias like stricta that grow around here, yours are going to be trees if you give them enough room.
I hope this was helpful.
Wildbloomers said:@DaisyI. Yes, I called that plant Consolea corallicola for years, and then it flowered. These three genera have so many similarities in form, size, variable spines, the way the trunks form etc. The flowers turn out to be the deciding factor.