Base of the plant.

I'm no help here. Just too many look a likes. Even hybirds. Best bet is to check with where you bought it. Even at big box stores, check with the manager to check with the supplier.
Stush

It didn't come from a box store, but from someone who has a hobby greenhouse and sometimes sells what he propagates. He couldn't remember the species, but that's a gallon pot it's in, so it's fairly large.

Everyone knows it's hazardous to one's reputation to ID a plant from a photo. But since I have no reputation, my guess is that it might be S "Ed Eby", previously known as S. patens. If it's Ed Eby, it originated from a plant collected in Koko Crater, Hawaii and can't be traced back to it's African origin.