But Potentillia has leaves with serrated edges whereas these that you have dont seem to.
Is it a variety of poppy maybe? There are several varieties with leaves that have this sort of shape and may fit with the idea of being given as a gift for remembrance, although I am not certain. I was given Forget-me-not seeds!
The colour purple, in all its hues makes my soul sing! 
(Sighs)
I think you’ve got it, Artangel. It looks like a potentilla now I
see the flower opening.