Additional file 4.

Variation of bioclim variable BC19 for Isolona. Indicates the variation of bioclim variable BC19 for all sampled species in Isolona. West/Central African species: 1: Isolona congolana; 2: I. hexaloba; 3: I. pleurocarpa; 4: I. zenkeri; 5: I. campanulata; 6: I. cooperi; 7: I. dewevrei; 8: I. thonneri; 9: I. cauliflora. East African species: 10: I. heinsenii; 11: I. linearis. Malagasy species: 12: I. capuroni; 13: I. ghesquierei; 14: I. perrierii.

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Couvreur et al. BMC Evolutionary Biology 2011 11:296   doi:10.1186/1471-2148-11-296