Is there a decent taxonomy of wine varietals?

[hotwine]

Doc, the Google search also turned up grape DNA work being done at Cornell, Fresno State, Adelaide and Mizzou. Lots of people are working on the subject, but it's still a very new field of study. And results must be thoroughly vetted, of course. For example, there is still disgreement regarding the popular contention that California Zinfandel is directly linked to (and perhaps even a clone of) Italian Primativo. The chart you seek is still a glimmer in the eye of the researchers.