Bogor Botanical Gardens
"Nepenthes eustachya" was probably first collected in February 1856 by Johannes Elias Teijsmann on the Sumatran coast near the port town of Sibolga. This specimen, "Teijsmann 529", was designated as the lectotype of "N. eustachya" by Matthew Jebb and Martin Cheek in their 1997 monograph. It is deposited at the herbarium of the Bogor Botanical Gardens along with two isotypes.