Flaveria trinervia
 Flaveria trinervia is a species of flowering plant in the aster family known by the common name clustered yellowtops. It is native to parts of the Americas including the southeastern and southwestern United States most of Mexico and parts of the Caribbean but it is known in many other places as an introduced species and often a noxious weed such as in Hawaii. It grows easily in many types of wet habitat including saline and alkaline soils and highly disturbed habitat.