Ruehssia tholiformis (Juárez-Jaimes & Alvarado) L.O. Alvarado Ruehssia tholiformis (Juárez-Jaimes & Alvarado) L.O. Alvarado in Phytoneuron 47: 16. 2021 sec. Alvarado-Cárdenas & al. 2021≡Marsdenia tholiformis Juárez-Jaimes & L.O. Alvarado in Candollea 65(1): 64, fig. 2. 2010 syn. sec. ???