Chthamalia

Chthamalia is a genus of flowering plants in the dogbane family (Apocynaceae: Gonolobinae). The genus was first formally named in 1844.^[2] It contains approximately 21^[1] species native to Mexico and the southern United States. Chthamalia is accepted as a genus by Plants of the World Online,^[1][3] but is considered by some others to be a synonym or a subgenus of Matelea.^[4]

Chthamalia
Chthamalia ojadapantha in highland central Mexico
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Gentianales
Family:	Apocynaceae
Subfamily:	Asclepiadoideae
Tribe:	Asclepiadeae
Subtribe:	Gonolobinae
Genus:	Chthamalia Decne.
Species[1]
21; see text

21 SPECIES accepted by Plants of the World Online as of May 17, 2025:

• Chthamalia atrostellata Morillo | USA (Texas) & Mexico (Coahuila)
• Chthamalia biflora Decne. | USA (Oklahoma & south-central states)
• Chthamalia brevicoronata (B.L.Rob.) Morillo | USA (southern Texas)
• Chthamalia camporum (Brandegee) Morillo | Mexico (Coahuila)
• Chthamalia castanea (Brandegee) Morillo | Mexico (Puebla, Oaxaca)
• Chthamalia chihuahuensis (A.Gray) Morillo | USA (SW New Mexico) & northern Mexico
• Chthamalia cynanchoides (Engelm. & A.Gray) Morillo | USA (Central Oklahoma to SE Texas and W Louisiana
• Chthamalia decumbens (W.D.Stevens) L.O.Alvarado & E.B.Cortez | Mexico (Durango to México State)
• Chthamalia lesueurii (Standl.) Morillo | Mexico (Sonora, Chihuahua)
• Chthamalia nummularia Decne. | Mexico
• Chthamalia ojadapantha (L.O.Alvarado, S.Islas & M.G.Chávez) S.Islas & M.G.Chávez | Mexico (Querétaro to Oaxaca)
• Chthamalia parviflora (Torr.) L.O.Alvarado & E.B.Cortez | USA (Central & S Texas) and NE Mexico
• Chthamalia pedunculata Decne. | Mexico
• Chthamalia producta (Torr.) L.O.Alvarado & E.B.Cortez | USA (Arizona & Texas) and northern Mexico
• Chthamalia prostrata (Cav.) L.O.Alvarado & Cortez | Mexico (NE & central states)
• Chthamalia pubiflora Decne. | USA (SE Georgia & Florida)
• Chthamalia radiata (Correll) Morillo | USA (S Texas)
• Chthamalia schaffneri (A.Gray ex Hemsl.) L.O.Alvarado & M.G.Chávez | Mexico (NE states into Veracruz)
• Chthamalia tehuacana Castañeda-Zárate, M.G.Chávez & L.O.Alvarado | Mexico (Puebla)
• Chthamalia texensis (Correll) Morillo | USA (SW Texas)
• Chthamalia wootonii (Vail) Morillo | Mexico (Sonora, Chihuahua)