Seems Begonia is popular today…I've been searching an ID for one of mine…
I'm not completely sure, but as I was searching this site, I may have seen one like yours…Just can't remember which one. I think I went through most all that were rhizo's. http://www.begonias.org/
I put that cracked pot there to keep the leaves up off the dirt and hopefully to keep the cats from sleeping on it. It's only the top of the pot, it only goes a couple inches into the ground.
Wow! There are a lot of them. Plus, they always seem to make it difficult to just quickly look through the pictures. I do now know that it is a Rhizomatous begonia, and that's probably enough for me. Thanks.
There are so many that I was starting to go cross eyed! After searching for mine, I figured I'd pass on the link… I wasn't sure I wanted to go searching again!