There are three genera of cycads in Colombia:Cycas, with two introduced and unnaturalized species; the endemic genusChigua, with two species; andZamia, with 16 species, seven of which are endemic. Keys to all species are given, as well as complete descriptions, synonymy, types, exisiccatae, distributional data, and conservation status as used in the 1997 IUCN Red List of Threatened Plants. Floristically, Zamiaceae is represented in Colombia by four elements: a Choco, southern Cordoba, and northeastern Antioquia element, with the endemic genus,Chigua, and six species ofZamia, Z. amplifolia, Z. disodon, Z. manicata, Z. roezlii,Z. chigua, and Z.obliqua, with the first two endemic to Colombia; a montane element in the northern Cordillera Occidental, with two endemic species,Z. montana and Zwallisii; a Rio Magdalena Valley element, with Z.muricata, Z. poeppigiana, and the endemic Z.encephalartoides; and an element east of the Andes and principally Amazonian, with four other species, Z.amazonum, Z. lecointei, Z. ulei, and the nearly endemic Z.hymenophyllidia.