Found this in my random seed patch:
I know you'll know what it is
I think that's Godetia, which is also called Clarkia sometimes but what I call Clarkia is the pink and mauve frilly ones to the right of the pic.
Probably been reclassified since my distant childhood. My mother grew those
I had Goditia like that last year.
I've just been trying to get that straight in my head, as I thought the other smaller flowered ones were the only clarkias... How complicated!
I quite like them - I think I might grow them again...