Nepenthes × ferrugineomarginata (; from Latin ferrugineus "rust coloured" and marginatus "margined") is a natural hybrid between N. albomarginata and N. reinwardtiana.[1] It has been recorded from the islands of Borneo and Sumatra.[2] The type specimen was collected by Shigeo Kurata in Kenukat, West Kalimantan, in 1981. Kurata described the hybrid the following year. The name is a nomen invalidum as it was published without a Latin description.[3]
Nepenthes × ferrugineomarginata has the longest binomial name of any plant in the genus.