purple and violet

My older, purplish violet is blooming.

So is the newer one, with darker leaves, that I picked up on a whim from nursery a few months ago. Funny, each bunch of flowers on it has a different appearance. One has flowers almost all purple with just a hint of white edges-

Another bunch has wider margins-

And on the third they're mostly white with purple centers-

I don't know why there's such variation on one plant, but it's interesting.