Begonia popenoei is a collected species I was given from Selby Botanical gardens years ago. The collection data is as follows
(Begonia popenoei 57930 A Pavana central America)This is one of the largest Begonias I have grown. Mature plants grow around 2 to 3 feet tall with leaves around 8 inches to 1 foot long. Plants sold in 4 1/2 inch pots.