Biogeography of Nicotiana section Suaveolentes (Solanaceae) reveals geographical tracks in arid Australia

A biogeographical analysis of Nicotiana section Suaveolentes reveals distinct geographical tracks in arid Australia, shaped primarily by vicariance rather than range expansion. The study, using phylogeny based on morphology and molecular data, identified three major biogeographical tracks—northern, central, and southern—that reflect the continent's aridification history, dating back to at least the Early Miocene (15 million years ago). These tracks connect regions like the Great Sandy Desert, Western Desert, and Nullarbor, with plesiomorphic taxa occurring on continental peripheries and derived taxa marking internal arid zones. The research provides insight into the evolutionary history of this largely Australian-endemic plant group and its adaptation to arid conditions.

Ladiges, P. Y., Marks, C. E., & Nelson, G. (2011). Biogeography of Nicotiana section Suaveolentes (Solanaceae) reveals geographical tracks in arid Australia. Journal of Biogeography, 38(11), 2066–2077. https://doi.org/10.1111/j.1365-2699.2011.02554.x