Please help me identify this one. I’ve got no idea where it comes from. Even the specialists at FlowerChecker couldn’t help me.
All I know is that it’s quite robust (i.e. undemanding) and is able to quickly develop new branches.
It looks to me like a Nematanthus or "Goldfish Plant" of some sort, most likely N. gregarius which is the most common species.
Like most Gesneriads, they truly are robust and are easily propagated from stem cuttings or even fallen leaves.