YamBase is a database containing breeding data for Yam (genus Dioscorea). Yam species that are being used for breeding include Dioscorea rotundata, Dioscorea cayenensis (both are native to Africa and the major cultivated species), Dioscorea aleata (native to Southeast Asia), and Dioscorea praehensilis, as well as several other species. YamBase contains phenotypic and genotypic data, as well as trial metadata from breeding programs in Africa.