Marsdenia steyermarkii Woodson Marsdenia steyermarkii Woodson in Ann. Missouri Bot. Gard. 28(3): 285. 1941 sec. Juárez-Jaimes & al. 2007=Vulcanoa steyermarkii (Woodson) Morillo in Pittieria 39: 254. 2015 syn. sec. Tropicos 2013