References
For Nicotiana
Barboza et al. 2016. In Kadereit, J.W., and V. Bittrich. 2016. The families and genera of flowering plants. XIV. Flowering plants – Eudicots – Aquifoliales, Boraginales, Bruniales, Dipsacales, Escalloniales, Garryales, Paracryphiales, Solanales (except Convolvulaceae), Icacinaceae, Metteniusaceae, Vahliaceae. Springer, Berlin. 412 pp. Google Scholar
Goodspeed, T. H. 1954. The genus Nicotiana: origins, relationships and evolution of its species in the light of their distribution, morphology and cytogenetics. Chronica Botanica Co., Waltham, Mass. 536 pp. Google Scholar
Knapp, S. 2023. Nicotiana. In Flora of North America Editorial Committee. 2023c. Flora of North America north of Mexico. Volume 14, Magnoliophyta: Gentianaceae to Hydroleaceae. Oxford Univ. Press, New York, NY. 505 pp. Google Scholar
Knapp, S., M.W. Chase, and J.J. Clarkson. 2004. Nomenclatural changes and a new sectional classification in Nicotiana (Solanaceae). Taxon 53: 73-82. Google Scholar