When I researched it, it seemed that it was j just a named variety in the family, and there are hundreds of unnamed ones. But this one got popular so purple called it that to differentiate it from the rest
There are more, but not in the ARS collection. N. Rustica is a "taxa", N Tabacum is another. N Tabacum has 1871 varieties in it and it is the one from which the vast majority of tobacco are produced.
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