Ruehssia mexicana (Decne.) L.O. Alvarado Ruehssia mexicana (Decne.) L.O. Alvarado in Phytoneuron 47: 14. 2021 sec. Alvarado-Cárdenas & al. 2021≡Marsdenia mexicana Decne., Prodr. 8: 617. 1844 syn. sec. ???