Originally Posted By: BEB
The OCW has a fairly broad definition that permits both naturally occurring and man-made hybrids, but does not seem to restrict the definition to V.vinifera and v. lambrusca (or other species).

The viticultural definition of hybrid, as supported by OCW, is the offspring of a crossing between varieties of different species.

Whether man-made or naturally occurring doesn't affect the definition.

I thought the title of this discussion suggested that the real dividing line with grape varieties is between vitis vinifera and everything else. A cross between two varieties of v. lambrusca maybe a cross but it still isn't v. vinifera. A crossing between v. vinifera and anything else is a hybrid and so isn't v. vinifera.

Originally Posted By: BEB
Pinotage was described as a French Hybrid which is supported by other sources.

I'd be interested to know of these sources.

Originally Posted By: BEB

If a hybrid is technically v. vinifera and non v. vinifera, then what, technically, is a man-made crossing of v. vinifera with a different v. vinifera (say, crossing pinot noir with syrah)?

A cross.

Interesting you choose pinot & syrah; that is one of the theories of the parentage of Pinotage discussed in my book.