The CU Flower Prototype was an animatronic figure that was used on the Concept Unification Prototype Stage. It presumably had a mouth movement and no others, like all other versions of the Flower character.
It seems like one or two sets were made, as there is the set from the CU Prototype Stage but also a photo of these flowers from a 'Surprises' test at the Arlington, Texas location. This may be potentially be the same set, but may not be as the basket has a different pattern and the leaves are different. It is impossible as of right now to work out if these are the same set.
The flowers as seen on the CU Prototype Stage.
A picture of these bots taken at the Arlington, Texas location. They were supposedly used for a test of the 'Surprises' concept.