Oncidium geertianum C. Morren Oncidium geertianum C. Morren in Ann. Soc. Roy. Agric. Gand 4: 55, t. 179. 1848 sec. Soto-Arenas & al. 2007=Oncidium caesium Rchb. f., Gartenflora 75. 1854 syn. sec. Solano Gómez & al. 2020