Chthamalia is a genus of flowering plants in the dogbane family (Apocynaceae: 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, but is considered by some others to be a synonym or a subgenus of Matelea.
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)
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