Vein count is the number of vein pairs in each leaf. Actually, your photo is good enough that it appears to be 11-13. It will vary from one variety to another. I would venture a guess that a plant blooming at this time of year it NOT fragrant? That's another thing that can help in identification. I'm betting that will become a fairly large plant and I don't have very many of those in the garden; so likely others with larger areas might have a better idea of its name.