I have three begonias and love all of them. I'm quickly finding that they are indeed one of my favorites. I think I've IDed one positively (Begonia soli-mutata) from one of the threads. The other is another type of rex (no idea yet, it's pinkish) but I can't find this one or am unsure.
So far from research in the plant files I've at least gathered that this is a cane type of begonia. I got it as a one stemmed tiny plant with two leaves and my bad boy has blossomed into a beauty. I usually just hear it called a dragon-winged begonia. However, when I search that a lot of angel-winged begonias come up. But research doesn't really provide me with pictures of the same plant. The closest I've come to on the plant files has been this one. Is it right? I noticed mine has a lot more spots?