Hey bikedocotor, there are several traits to each tobacco which make them distinct, I am not familair with all of them but will offer what knowledge I have; Virginias are normally an earthy brown colour, unless they are red or heat treated, (which I think will bring their colour closer to black), they normally expend a sweet, creamy flavour. Perique will give you a sensation of pepper being on your tongue, a bit like eating a very mild chilli infused dish. Latakia has a very sharp smell to it, someting you can really taste on the back of your pallet even without smoking, its a sharp, smoked, smell, that is particular.
I don't want to go any further because what I'd write on other varieities such as Cavendish and Burley would be based on conjecture, however, I'm sure the link above will serve as a suitable resource!