Several names have been coined using the name Eustephia but referring to species now considered better suited to other genera (Hieronymiella or Phycella). Here are links to help you find appropriate information
^Jørgensen, P. M., M. H. Nee & S. G. Beck. (eds.) 2014. Catálogo de las plantas vasculares de Bolivia, Monographs in systematic botany from the Missouri Botanical Garden 127(1–2): i–viii, 1–1744. Missouri Botanical Garden Press, St. Louis
^Macbride, J. F. 1936. Amaryllidaceae. 13(1/3): 631–690. In J. F. Macbride (ed.) Fl. Peru. Publ. Field Mus. Nat. Hist., Bot. Ser. Field Museum, Chicago