Recherches sur les Encephalartos Lehm.(Zamiaceae) d'Afrique centrale 2. Apport de la morphologie foliaire dans la différenciation spécifique

The authors recall the strong interest of Melville's nomenclature for cones descriptions in Zamiaceae. They pinpoint the lack of such a framework for the description of leaves, while unfertile plants are common in the field. Therefore, they propose a schema involving some 22 characteristic points to be mentionned. An application is realized with the description of a new species from Zaire: Encephalartos schaijesii