Myriophyllum verticillatum L. (Synonym : Myriophyllum siculum Guss.)

Family : Haloragaceae

Myrmechis japonica (Rchb.f.) Rolfe (Synonym : Odontochilus japonicus (Rchb.f.) T.Yukawa)

Family : Orchidaceae

Nageia nagi (Thunb.) Kuntze

Family : Podocarpaceae

Najas graminea Delile (Synonym : Najas serristipula Maxim.)

Family : Najadaceae

Najas marina L. (Synonym : Najas major All.)

Family : Najadaceae

Najas minor All. (Synonym : Caulinia fragilis Willd.)

Family : Najadaceae

Nandina domestica Thunb.

Family : Berberidaceae

Nanocnide japonica Blume (Synonym : Nanocnide dichotoma S.S.Chien)

Family : Urticaceae

Narcissus tazetta L. subsp. chinensis (M.Roem.) Masam. & Yanagita (Synonym : Narcissus tazetta L. var. suisen Siebold)

Family : Amaryllidaceae

Nasturtium officinale W.T.Aiton (Synonym : Sisymbrium cardaminefolium Gilib.)

Family : Brassicaceae [Naturalized plant]