[OWL-Guide] error in use of "varietals" Sec 3.1.3.

In my opinion, the use of the phrase "grape varietals" is erroneous.
The correct term in botanical taxonomy is "variety" (or "cultivar").
"Varietal" is an adjective applicable only to wines; thus, "varietals"
in the plural is an elliptic reference to "varietal wines".  Cabernet
Sauvignon (wine) is a "varietal wine" - made from grapes grown on
Cabernet Sauvignon grapevines, not ablend.  Chianti is a non-varietal
wine made from a flexible blend of grape varieties in a particular
region of Italy. 
I hate to be pedantic, but there's a certain irony in seeing taxonomic
terms abused when the whole focus is about the precise construction of a
taxonomy. 
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