I have a garden full of these, they can vary a little or a lot. They crossed from Geranium versicolor which I have, and another which I got from a neighbour and I think is Geranium endressii Wargrave Pink.
The general name for these crosses is Geranium x oxonianum. There are several selections which have been named, but they cross breed like rabbits.
https://www.google.co.uk/searc...