The large leaf vinca with a flower

A single flower from the other periwinkle or vinca. I've been looking at plants in the garden centers and one with leaves of a similar size to this are labeled as Vinca major. So this one could be Vinca major and the other with the much smaller leaves be a Vina minor. I thought that the V. major had hairs around the leaf margin, but maybe that is not necessary.

Photo 4471