[3] Its two parent species are very closely related and so N. × harryana, which is intermediate in form, may be difficult to distinguish from either of them.

Burbidge wrote of it as follows:[2] Apart from these I found an intermediate between N. villosa and N. Edwardsiana, also epiphytic on Casuarina.

[4] B. H. Danser, in his 1928 revision, wrote that N. × harryana could be a hybrid as Macfarlane suggested or a form of N. villosa together with N. edwardsiana.

However, N. villosa plants from Mount Tambuyukon are easier to confuse with this hybrid, as they produce pitchers that may be elongated slightly above the hip.

[7] N. edwardsiana is not known to grow along the summit trail, enabling easier identification of N. × harryana plants.