Tridax is a genus of flowering plants in the daisy family. Tridax is native primarily to the tropical regions of North and South America. Tridax procumbens has become naturalized in the southern United States and is considered a noxious weed in some places. see Calea Layia Sabazia \n* Tridax accedens - Calea verticillata \n* Tridax ehrenbergii - Sabazia sarmentosa \n* Tridax gaillardioides - Layia gaillardioides \n* Tridax verticillata - Calea verticillata