this a plant i saw this summer at longwood gardens in PA, in the conservatory.
seems like a new variety - was just one and i couldn't locate the label.

Stunning!!

That sure is a beauty! I'm really bad at comparing photos but it might be the cultivar 'Tropic Breeze' and If it is in fact Dieffenbachia 'Tropic Breeze' we could use a few photo's in our database! Dumbcane (Dieffenbachia 'Tropic Breeze')

Here are a couple of photos I found on-line for comparison:

http://www.delrayplants.com/pl...

'tropic breeze' is gorgeous! but the leaves are narrower.
i actually went to the plant locator for Longwood and located all dieffs on the map and then based on my pic sequence and some googling figured it out!
it's 'Ely'. and i found the patent too (2007) - so quite recent. it says it is compact and suckers well - just what is needed indoors!
i used to have a regular one that grew into a 7' 'tree' in 10 years! smth smaller like 'ely' would be much more manageable!
i am just learning all the ropes on this site - i'll see if i can manage to import it into the database ;).

It sure is a pretty one ... and I see you uploaded your photo to the database!