Is there a decent taxonomy of wine varietals?

[DrHow]

hotwine posted the U. C. Davis link. It is reassuring to know that there are some folks who are working on assembling the data. However, what I was hoping for was a succinct graphical representation of the relationships which can be inferred from such data. Actually, the little linked article does not give me much hope that what I seek has been worked out yet. I am more interested in the RESULTS of this effort than the effort itself. At least there is some prospect of its happening.