''Chthamalia'' is a genus of

flowering plant Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (). The term angiosperm is derived from the Ancient Greek, Greek words (; 'container, vessel') and (; 'seed'), meaning that the seeds are enclosed with ...

s in the dogbane 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. Notable mem ...

: Gonolobinae). The genus was first formally named in 1844. It contains approximately 21 species native to Mexico and the southern United States. ''Chthamalia'' is accepted as a genus by ''

Plants of the World Online Plants of the World Online (POWO) is an online taxonomic database published by the Royal Botanic Gardens, Kew. History Following the Convention on Biological Diversity, the Royal Botanic Gardens in Kew launched Plants of the World Online i ...

'', but is considered by some others to be a synonym or a subgenus of ''

Matelea ''Matelea'' is a genus of flowering plants in the family Apocynaceae. It contains about 200 species, which are commonly known as milkvines. Some people consider '' Chthamalia'' to be a synonym to or a subgenus of ''Matelea''. Species , Plants of ...

''. 21 SPECIES accepted by Plants of the World Online as of May 17, 2025: *'' Chthamalia atrostellata'' , USA (Texas) & Mexico (Coahuila) *'' Chthamalia biflora'' , USA (Oklahoma & south-central states) *'' Chthamalia brevicoronata'' , USA (southern Texas) *'' Chthamalia camporum'' , Mexico (Coahuila) *'' Chthamalia castanea'' , Mexico (Puebla, Oaxaca) *'' Chthamalia chihuahuensis'' , USA (SW New Mexico) & northern Mexico *'' Chthamalia cynanchoides'' , USA (Central Oklahoma to SE Texas and W Louisiana *'' Chthamalia decumbens'' , Mexico (Durango to México State) *'' Chthamalia lesueurii'' , Mexico (Sonora, Chihuahua) *'' Chthamalia nummularia'' , Mexico *'' Chthamalia ojadapantha'' , Mexico (Querétaro to Oaxaca) *'' Chthamalia parviflora'' , USA (Central & S Texas) and NE Mexico *'' Chthamalia pedunculata'' , Mexico *'' Chthamalia producta'' , USA (Arizona & Texas) and northern Mexico *'' Chthamalia prostrata'' , Mexico (NE & central states) *'' Chthamalia pubiflora'' , USA (SE Georgia & Florida) *'' Chthamalia radiata'' , USA (S Texas) *'' Chthamalia schaffneri'' , Mexico (NE states into Veracruz) *'' Chthamalia tehuacana'' , Mexico (Puebla) *'' Chthamalia texensis'' , USA (SW Texas) *'' Chthamalia wootonii'' , Mexico (Sonora, Chihuahua)

References

Asclepiadoideae Apocynaceae genera Flora of Northern America {{Apocynaceae-stub