ɪts tˈuː pˈɛɹənt spˈiːsiːz ɑːɹ vˈɛɹi klˈoʊsli ɹᵻlˈeɪɾᵻd ænd sˌoʊ ˈɛn. tˈaɪmz hˌæɹɪˈɑːnə, wˌɪtʃ ɪz ˌɪntɚmˈiːdiət ɪn fˈɔːɹm, mˈeɪ biː dˈɪfɪkəlt tə dɪstˈɪŋɡwɪʃ fɹʌm ˈiːðɚɹ ʌv ðˌɛm.
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.