The nodule shape of more than four hundred species of wild legumes indigenous to Rhodesia is found to be related to the tribal classification of the host. Characteristic nodule-shapes of the papilionaceous tribes Galegeae, Genisteae, Hedysareae, and Phaseoleae, and of the subfamilies Mimosoideae and Caesalpinioideae are described and figured. Non-nodulating species were found to have coloured roots much more frequently than nodulating species.