Ruehssia pringlei (S. Watson) L.O. Alvarado Ruehssia pringlei (S. Watson) L.O. Alvarado in Phytoneuron 47: 15. 2021 sec. Alvarado-Cárdenas & al. 2021≡Marsdenia pringlei S. Watson in Proc. Amer. Acad. Arts 25: 158. 1890 syn. sec. ???