This is Primulina bipinnatifida. A cool newer Primulina from East Asia/China. This plant and a very similar one, Primulina repanda, var. guilinensis (whose leaves smell incredible to me) both are hard to get to set seed. They try their best to not self pollinate.

Here's a bit of an article talking about that.
http://www.guihaia-journal.com/ch/reader/view_abstract.aspx?file_no=20120501