You might want to read up on a common plant disease called aster yellows. Sometimes the symptoms of the disease produce rather striking blooms. Unfortunately, once infected, there is no cure. Diseased plants should be promptly removed and discarded to reduce further spread.

In my opinion, plants like Green Jewel and so on with green blooms should not have been released. This is going to cause confusion with people not knowing if a plant has Aster Yellows or not. I agree this sounds like a phytoplasma infection. I would really be cautious with this plant especially if you have other Echinaceas growing nearby.