ABSTRACT
I N STUDYING the mountain flora of Central Africa, one is struck by the simi-larities found in mountainous massifs often separated by considerable dis-tances. This inevitably implies a common origin, which must be located in time and space. Particularly in the Congolese mountains, the phytogeographic interest revealed by the Ruwenzori-which is, except for the adjacent Virunga, very isolated in relation to the other massifs of comparable altitude-must be stressed.
