American Horticultural Society, October 1952, pg. 237-259; Concerning Rex Begonia, by B. Y. Morrison The following descriptions are recorded from observation notes made of the living collection during 1951-1952: Leila. Large leaves. rather flat but with some puckering over surface. Small dark green center that follows major veins in star-like pattern into the broad silver-green zone. which in turn breaks up into large blotches over the dark green margin, edge purplish.