Variation and geographical distribution of ploidy levels in Pennisetum section Brevivalvula (Poaceae) in Burkina Faso, Benin and southern Niger /Renno, Jean-François Schmelzer, G. De Jong, J.H. RESSOURCES VEGETALES SPONTANEES POLYPLOIDE APOMIXIE REPARTITION GEOGRAPHIQUE COMPLEXE D'ESPECES Pennisetum sect. Brevivalvula is a species complex characterized by polyploidy and apoximis. Ploidy level was assessed by DAPI-flow cytometry for 304 plants of the section, originating from Burkina Faso, Benin and southern Niger. The results were confirmed for 54 plants based on chromosome counts. The samples show four euploidy levels (with x = 9) distributed among five species : P. hordeoides (2n = 36, 54), P. pedicellatum (2n = 36, 45, 54), P. polystachion (2n = 18, 36, 45, 54), P. setosum (2n = 54), and P. subangustum (2n = 18, 36, 54). The geographical distribution of these ploidy levels seems related to major vegetation zones present in Africa. Diploid populations of P. polystachion and P. subangustum were found in the Banfora area, in Burkina Faso. (Résumé d'auteur) 1995 text https://www.documentation.ird.fr/hor/fdi:010012144 fdi:010012144 Renno Jean-François, Schmelzer G., De Jong J.H.. Variation and geographical distribution of ploidy levels in Pennisetum section Brevivalvula (Poaceae) in Burkina Faso, Benin and southern Niger. 1995, 198, 89-100 EN BURKINA FASO BENIN