Chthamalia

Chthamalia is a genus of flowering plants in the dogbane family (Apocynaceae: Gonolobinae). The genus was first formally named in 1844. It contains approximately 10 to 15 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 others to be a synonym or a subgenus of Matelea.
 * Chthamalia biflora Decne.
 * Chthamalia decumbens (W.D.Stevens) L.O.Alvarado & E.B.Cortez
 * Chthamalia nummularia Decne.
 * Chthamalia ojadapantha (L.O.Alvarado, S.Islas & M.G.Chávez) S.Islas & M.G.Chávez
 * Chthamalia parviflora (Torr.) L.O.Alvarado & E.B.Cortez
 * Chthamalia pedunculata Decne.
 * Chthamalia producta (Torr.) L.O.Alvarado & E.B.Cortez
 * Chthamalia prostrata (Cav.) L.O.Alvarado & Cortez
 * Chthamalia pubiflora Decne.
 * Chthamalia schaffneri (A.Gray ex Hemsl.) L.O.Alvarado & M.G.Chávez