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The family Convolvulaceae in Muang District, Nong Khai Province was studied between February and August 2006. Five genera and 25 species are recognized. Five species are cultivated as ornamentals. The most abundant is Ipomoea with 12 species. Most species are herbaceous climbers and woody climbers except Ipomoea carnea Jacq. which is an erect herb. The habit, flowering periods, photographs and vernacular name of all plants are recorded.