Dieffenbachia what?

[bubba]

In the Ming aralia (?) thread below, Marie Nock was kind enough to opine that the specimen that I presented was not a Ming aralia. In that thread, I presented her with another specimen, which was out of the ordinary, which she aptly devined was a Dieffenbachia but she did not know what species. I would like to thank her for sharing her kind expertise and also provide it to the Board for identification of what species of Dieffenbachia this specimen is:

[bubba]

Please find a helpful Wikipedia site, which articulates numerous species, many of which are unknown:

https://en.wikipedia.org/wiki/Dieffenbachia
 

After looking closely at the only two species with pictures, I am guessing Dieffenbachia longispatha. This specimen is growing in the prodigious garden of Gene Joiner in Lake Worth, Florida. He has many specimens in this garden that are incredibly rare. Please lend me your opinions and thoughts.