''Tridax'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial n ...

of flowering plants in the family

Asteraceae The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Commonly referred to as the aster, daisy, composite, or sunflower family, Compositae ...

.Tropicos, ''Tridax'' L.
/ref> ''Tridax'' is native primarily to the tropical regions of

North North is one of the four compass points or cardinal directions. It is the opposite of south and is perpendicular to east and west. ''North'' is a noun, adjective, or adverb indicating direction or geography. Etymology The word ''no ...

and

South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere at the northern tip of the continent. It can also be described as the souther ...

. '' Tridax procumbens'' has become naturalized in the southern United States and is considered a noxious weed in some places. ; SpeciesFlann, C (ed) 2009+ Global Compositae Checklist
/ref> ; formerly included see '' Calea Layia Sabazia'' * ''Tridax accedens - Calea verticillata'' * ''Tridax ehrenbergii -

Sabazia sarmentosa ''Sabazia'' is a genus of Colombian and Mesoamerican plants in the tribe Millerieae within the family Asteraceae. ; Species * ''Sabazia acoma'' (S.F.Blake) Longpre - Colombia * ''Sabazia densa'' Longpre - Costa Rica * ''Sabazia durangensis'' (Lon ...

'' * ''Tridax gaillardioides - Layia gaillardioides'' * ''Tridax verticillata - Calea verticillata''

References

Millerieae Asteraceae genera Taxa named by Carl Linnaeus {{Millerieae-stub