Echinobivia is not a recognized species. Echinobivia is supposed to be a hybrid between Echinopsis and Lobivia but if you Google Echinopsis x Lobivia Rainbow Burst, you get this:
http://www.cactiguide.com/foru...
Which doesn't look anything like what is being labeled Echinobivia Rainbow burst.
https://www.google.com/search?...
I have one and it is labeled Echiobivia Rainbow Burst. It looks exactly like the pink one above. I would love it if it did look like the first photo of Echinopsis x Lobivia.
Confused yet?
Daisy