Evolution in African tropical trees displaying ploidy-habitat association: the genus Afzelia - Donkpegan, A.S.L.; Doucet, J.L.; Migliore, J.; Duminil, J.; Dainou, K.; Piñeiro, R.; Wieringa, J.J.; Champluvier, D.; Hardy, Olivier J. (Elsevier, 2017)