Summary
In a study designed to elucidate the taxonomy of Solanum incanum sensu lato, S. incanum L., S. campylacanthum Hochst. ex A. Rich., S. panduriforme E. Mey. ex Dunal and S. lichtensteinii Willd. from Africa and SW Asia were investigated using crossability and morphometric techniques. It is proposed that S. panduriforme is, in fact, a subspecies of S. campylacanthum (S. campylacanthum subsp. panduriforme) and that S. incanum and S. lichtensteinii are distinct species. Other information suggests that S. campylacanthum is more closely related to a common ancestor of S. incanum s.l. S. campylacanthum subsp. panduriforme and S. incanum are believed to have diverged away from S. campylacanthum-type predecessors in tropical E Africa, moving southwards or towards the Middle East, respectively. S. lichtensteinii probably evolved from an even earlier ancestor in its migration towards southern Africa.
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Acknowledgements
Firstly, my gratitude for expert advice and guidance given by the late Dr R. Lester and the late Prof. J. Hawkes OBE must be recorded here. My thanks also go to Mr A. Esquilant, Dr S. Hasan, Mr H. Jayawickrama and Dr J. Kang for their practical assistance. I would also like to thank Dr M. Vorontsova for assistance at K, Mr E. Thewlis who typed the original manuscripts and Mr J. Tennant for his encouragement. I am indebted to the many herbaria and plant collectors who provided the dried plant specimens used in this study. Lastly, I am grateful to the Annals of Botany journal for their research fellowship which funded the early part of this study, and also to the National Science Foundation (USA) for funding recent research on the PBI Solanum: a Worldwide Treatment project at K and BM.
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Samuels, J. Solanum incanum s.l. (Solanaceae): taxonomic relationships between S. incanum, S. campylacanthum, S. panduriforme and S. lichtensteinii . Kew Bull 67, 401–411 (2012). https://doi.org/10.1007/s12225-012-9373-5
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DOI: https://doi.org/10.1007/s12225-012-9373-5