In Daly City there is a produce market every Thursday and a guy is selling begonias and I found a tag in one of them that said, Antonelli Brothers Begonias santa cruz. So run do not walk, to get them while you can. They look as I remember them, and I have pictures of them posted on flickr too.
I still have at least this one that I can say for sure is the real thing. The big orange, I call it.

Here is a link that might be useful: serramonte produce market address on yelp