Nicotiana alata Link & Otto (Introduced)
Nicotiana rustica L. (Introduced)
Nicotiana tabacum L. (Cultivated)
Bengal Plants ii. 752, describes three Nicotiana species :-
Nicotiana (Solanaceae) page with images of species in efloraofindia : 1 post by 1 author.
I request you to pl. go through & point out mistakes, if any. I hope this will aid in identifications in future. If anybody can send images of other species of this genera (for incorporation in the website), if any, or can identify unidentified images, it will be really nice.