''Polystemma'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

flowering plant Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (), commonly called angiosperms. The term "angiosperm" is derived from the Greek words ('container, vessel') and ('seed'), and refers to those plants th ...

s of the family

Apocynaceae Apocynaceae (from ''Apocynum'', Greek for "dog-away") is a family of flowering plants that includes trees, shrubs, herbs, stem succulents, and vines, commonly known as the dogbane family, because some taxa were used as dog poison Members of the ...

first described as a genus in 1844. It is native to

Mexico Mexico (Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guatema ...

and

Central America Central America ( es, América Central or ) is a subregion of the Americas. Its boundaries are defined as bordering the United States to the north, Colombia to the south, the Caribbean Sea to the east, and the Pacific Ocean to the west. ...

. ;SpeciesThe Plant List, genus ''Polystemma''
/ref> # '' Polystemma guatemalense'' (Schltr.) W.D.Stevens - from Nayarit to Costa Rica # '' Polystemma mirandae'' Lozada-Pérez - Guerrero, Oaxaca, Puebla # '' Polystemma viridiflora'' Decne. - Michoacán, Veracruz, Oaxaca, Chiapas

References

Apocynaceae genera Asclepiadoideae Taxa named by Joseph Decaisne {{Apocynaceae-stub