"Nepenthes eustachya" × "N. longifolia" has been recorded from a number of locations near Payakumbuh and Sibolga, where its parent species are sympatric. It is relatively rare because "N. eustachya" and "N. longifolia" occur in markedly different habitats; the former usually grows in exposed, sunny sites, while the latter is more common in dense, shady forest. This hybrid differs from "N. eustachya" in having fringed lamina margins bearing short reddish-brown hairs. The peristome often has a distinctive raised section at the front, a characteristic inherited from "N. longifolia". It can be distinguished from "N. longifolia" on the basis of its shorter tendrils and the presence of longitudinal furrows on the surface of the lamina, similar to those of "N. eustachya".