The flora of Sango Bay (Uganda) and Minziro (Tanzania) is discussed: these areas comprise the floodplain of the Kagera River, with a mixed vegetation influenced by a flat relief and relatively high moisture through regular flooding. Protection is only partial, which is of concern as the sites form an area of high biodiversity with high conservation value, and several rare and/or (near-)endemic plant species. Both areas are proposed as Important Plant Areas, and a checklist of plant species is provided giving a total of 1324 taxa (species and infraspecifics) in 149 families. Seventeen species are endemic or near-endemic to the area. Although only a small percentage have so far been Red List-assessed, 10 are Near Threatened, 10 Vulnerable, 3 Endangered, and 1 Critically Endangered. More than 60 species not previously known from Tanzania have been recorded and added to the country's flora.