Hmmm. I too recieved my shipment of this plant with purplish sections extending to the tips and green to the base. I also see this plant in "The Aquarium Center" in Randallstown, MD. I believe that someone there told me that they recieve their plants from Florida Aquatic Nurseries, Inc.
My suspicion, and it is only based on that - suspicion. is that they cultivate this plant in very shallow water and allow it to grow along the surface. At the surface the leaves turn deep purple and the lower, submerged portions turn green.
I base this suspticion on the notion that most of these nurseries grow our underwater species immerse and it is up to us to return them to their desired state of being (submersed). After we buy them
I would love to know if this theory on the Diduplis is correct. Thanks
Chris from Baltimore