Can someone please say what is the scientific name of the plant that
provides cream of tartar?

Cream of tartar, potassium bitartrate, is a byproduct of wine production. The
scientific name of the plant is Vitis vinifera, although some grape varieties
are hybrids with other grape species.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)