"Nepenthes albomarginata" and "N. eustachya" grow in mixed populations at a number of locations in the Padang Highlands and Tapanuli. Natural hybrids between them appear to be relatively common around the river Tjampo in West Sumatra. A young plant of "N. albomarginata" × "N. eustachya" pictured in "Nepenthes of Sumatra and Peninsular Malaysia" was observed by Charles Clarke in 1998 on Bukit Kambut in West Sumatra. It grew in secondary vegetation amongst a population of "N. eustachya" at an elevation of around 900 m. This plant was subsequently destroyed, but Clarke and Troy Davis found a number of other plants on Bukit Tjampo. The hybrids were growing in a dense thicket of ferns ("Dicranopteris linearis" and "Dipteris" sp.) at approximately 750 m.