Cosmianthemum is a genus of flowering plants belonging to the family Acanthaceae.
Its native range is southeastern China, Hainan, Vietnam, Thailand, Peninsular Malaysia, and Borneo.
Species 14 species are accepted. Cosmianthemum angustifolium Cosmianthemum anomalum Cosmianthemum brookeae Cosmianthemum bullatum Cosmianthemum dido Cosmianthemum guangxiense Cosmianthemum knoxiifolium Cosmianthemum latifolium Cosmianthemum magnifolium Cosmianthemum melinhense Cosmianthemum obtusifolium Cosmianthemum punctulatum Cosmianthemum subglabrum Cosmianthemum viriduliflorum
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