Ampelography – The Study and Identification of Grapevines

I was cruising around the other day with Jerry Chong, our esteemed Grower Relations Manager, looking at various vineyards, and was thinking back to VIT 102.  This was one of my favorite classes since it was taught out in the experimental vineyard and focused, in part, on the arcane skill of ampelography.  A big part of the class was focused on morphology of various varietals, and being able to identify vines purely from the look of their leaves and canopy.  I had relatively little talent for this, but was incredibly impressed by the oracle-like skills of the instructor Andy Walker, who could have identified a specific varietal with his eyes closed and upside down.  Test your skills - can anybody tell me what the leaf is below?