"Nepenthes ovata" is also similar to "N. densiflora", with which it has been confused in the past. The two species can be reliably distinguished on the basis of the hook-shaped appendage, which is never present in "N. densiflora". In addition, the lower pitchers of "N. densiflora" have an elongated neck that is far longer than the same structure in "N. ovata". Furthermore, "N. densiflora" has differently shaped sepals in male and female flowers, whereas those of "N. ovata" are the same.