Pictured is a double flowered Begonia tuberhybrida. It is a garden form of tuberous begonia.
Keywordsflower, begonia, begonia tuberhybrida, tuberous begonia, double flowered begonia tuberhybrida
GalleriesFlowers and Shrubs: B
L. H. Bailey Standard Cyclopedia of Horticulture (New York, New York: The MacMillan Company, 1917) volume 1, page 475