| Nageliella angustifolia (Booth ex Lindl.) Ames & Correll | = | Domingoa gemma (Rchb.f.) Van den Berg & Soto Arenas |
| Nageliella purpurea (Lindl.) L. O. Williams | = | Domingoa purpurea (Lindl.) Van den Berg & Soto Arenas |
| Nanodes discolor Lindl. | = | Epidendrum schlechterianum Ames |
| Nanodes medusae Rchb. f. | = | Epidendrum medusae (Rchb. f.) Pfitzer |
| Nanodes porpax (Rchb. f.) Brieger & Lückel | = | Epidendrum peperomia Rchb. f. |
| Nanodes schlechterianum (Ames) Brieger | = | Epidendrum schlechterianum Ames |
| Nasonia ionanthera Rchb. f. & Warsz. | = | Fernandezia ionanthera (Rchb. f. & Warsz.) Schltr. |
| Nematoceras acuminatum (M. A. Clem. & Hatch) Molloy | = | Corybas acuminatus M. A. Clem. & Hatch |
| Nematoceras hypogaeum (Colenso) Molloy | = | Corybas trilobus (Hook. f.) Rchb. f. |
| Nematoceras orbiculatum (Colenso) Molloy | = | Corybas orbiculatus (Colenso) L.B.Moore |
| Neo-urbania nicaraguensis Hamer & Garay | = | Ornithidium nicaraguense (Hamer & Garay) M. A. Blanco & Ojeda |
| Neobathiea filicornu Schltr. | = | Neobathiea grandidierana (Rchb. f.) Garay |
| Neobathiea gracilis Schltr. | = | Aeranthes schlechteri Bosser |
| Neodryas herzogii Schltr. | = | Cyrtochilum rhodoneurum (Rchb. f.) Dalström |
| Neodryas rhodoneura Rchb. f. | = | Cyrtochilum rhodoneurum (Rchb. f.) Dalström |
| Neoescobaria brevis (Rolfe) Garay | = | Helcia brevis (Rolfe) Dodson in R. Escobar (ed.) |
| Neokoehleria corydaloides (Kraenzl.) Garay | = | Scelochilus corydaloides (Kraenzl.) Garay |
| Neokoehleria equitans Schltr. | = | Scelochilus equitans (Schltr.) Dodson & M. W. Chase |
| Neokoehleria kerspei Senghas | = | Scelochilus kerspei (Senghas) Königer |
| Neokoehleria langkastii Senghas | = | Scelochilus langkastii (Senghas) Dodson |
| Neokoehleria markgrafii Friedrich | = | Scelochilus markgrafii (Friedrich) Dodson & M. W. Chase |
| Neokoehleria penduliflora Senghas & Thiv | = | Scelochilus penduliflorus (Senghas & Thiv) Königer |
| Neokoehleria peruviana Schltr. | = | Scelochilus peruvianus (Schltr.) Dodson & M. W. Chase |
| Neokoehleria rauhii Senghas | = | Scelochilus rauhii (Senghas) Dodson & M. W. Chase |
| Neokoehleria thivii Senghas | = | Scelochilus thivii (Senghas) Königer |
| Neokoehleria wuerstlei Senghas | = | Scelochilus wuerstlei (Senghas) Königer |
| Neolauchea pulchella Kraenzl. | = | Isabelia pulchella (Kraenzl.) Van den Berg & M. W. Chase |
| Neolehmannia apagana (Mansf.) Garay & Dunst. | = | Epidendrum apaganum Mansf. |
| Neolehmannia barbeyana (Kraenzl.) Garay & Dunst. | = | Epidendrum barbeyanum Kraenzl. |
| Neolehmannia curvicolumna (Am) (Ames | = | Epidendrum simulacrum Ames |
| Neolehmannia difformis (Jacq.) Pabst | = | Epidendrum difforme Jacq. |
| Neolehmannia lechleri Rchb. f. | = | Epidendrum lechleri Rchb. f. |
| Neolehmannia peperomia (Rchb. f.) Garay & Dunst. | = | Epidendrum peperomia Rchb. f. |
| Neolehmannia platychilum Schltr. | = | Epidendrum platychilum Schltr. |
| Neolehmannia porpax (Rchb. f.) Garay & Dunst. | = | Epidendrum peperomia Rchb. f. |
| Neolehmannia williamsii (Dodson) Dodson | = | Epidendrum williamsii Dodson |
| Neomoorea irrorata (Rolfe) Rolfe | = | Neomoorea wallisii (Rchb. f.) Schltr. |
| Neotinea intacta (Link) Rchb. f. | = | Neotinea maculata (Desf.) Stearn |
| Neotinea tridentata (Scop.) R. M. Bateman subsp. conica (Willd.) R. M. Bateman | = | Neotinea tridentata (Scop.) R. M. Bateman subsp. commutata (Tod.) R. M. Bateman |
| Neotinea ustulata (L.) R. M. Bateman subsp. aestivalis (Kümpel) Jacquet & Scappat. | = | Neotinea ustulata (L.) R. M. Bateman var. aestivalis (K) Tali, M.F.Fay & R.M.Bateman |
| Neottia kashmiriana (Duthie) Schltr. | = | Neottia inayatii (Duthie) Schltr. |
| Neottia latifolia Rich. | = | Neottia ovata (L.) Bluff & Fingerh. |
| Neottia petola Blume | = | Macodes petola (Blume) Lindl. |
| Neottia repens (L.) Sw. | = | Goodyera repens (L.) R. Br. in W. T. Aiton |
| Neottianthe calcicola (W. W. Sm.) Schltr. | = | Neottianthe cucullata var. calcicola (W. W. Sm.) Soó |
| Neowilliamsia alfaroi (Ames & C. Schweinf.) Dressler | = | Epidendrum alfaroi Ames & C. Schweinf. |
| Nephelaphyllum grandiflorum Hook. f. | = | Tainia wrayana (Hook.f.) J.J.Sm. |
| Nervilia bathiei Senghas | = | Nervilia crociformis (Zoll. & Moritzi) Seidenf. |
| Nervilia dalbergiae Jum. & H. Perrier | = | Nervilia kotschyi (Rchb. f.) Schltr. var. purpurata (Rchb. f. & Sond.) Börge Pett. |
| Nervilia diantha Schltr. | = | Nervilia kotschyi (Rchb.f.) Schltr. |
| Nervilia grandiflora Schltr. | = | Nervilia renschiana (Rchb. f.) Schltr. |
| Nervilia humilis Schltr. | = | Nervilia crociformis (Zoll. & Moritzi) Seidenf. |
| Nervilia perrieri Schltr. | = | Nervilia affinis Schltr. |
| Nervilia prainiana (King & Pantl.) Seidenf. | = | Nervilia crociformis (Zoll. & Moritzi) Seidenf. |
| Nervilia reniformis Schltr. | = | Nervilia crociformis (Zoll. & Moritzi) Seidenf. |
| Nervilia sakoae Jum. & H. Perrier | = | Nervilia kotschyi (Rchb.f.) Schltr. |
| Nervilia simplex (Thouars) Schltr. | = | Nervilia petraea (Afzel. ex Sw.) Summerh. |
| Nervilia umbrosa (Rchb. f.) Schltr. | = | Nervilia bicarinata (Blume) Schltr. |
| Nigritella angustifolia Rich. | = | Gymnadenia nigra (L.) Rchb. f. |
| Nigritella angustifolia Rich. f. flava Jaccard | = | Gymnadenia nigra (L.) Rchb. f. f. flava Jaccard |
| Nigritella corneliana (Beauverd) Gölz & H. R. Reinhard | = | Gymnadenia corneliana (Beauverd) Teppner & E. Klein |
| Nigritella fragrans Saut. ex Rchb. | = | Gymnadenia nigra (L.) Rchb. f. |
| Nigritella gabasiana Teppner & E. Klein | = | Gymnadenia gabasiana (Teppner & E. Klein) Teppner & E. Klein |
| Nigritella globosa (L.) Rchb. | = | Traunsteinera globosa (L.) Rchb. |
| Nigritella lithopolitanica Ravnik | = | Gymnadenia lithopolitanica (Ravnik) Teppner & E. Klein |
| Nigritella miniata (Crantz) Janch. | = | Gymnadenia nigra (L.) Rchb. f. |
| Nigritella nigra (L.) Rchb. f. in H. G. L. Reichenbach | = | Gymnadenia nigra (L.) Rchb. f. |
| Nigritella nigra (Crantz) Janch. subsp. austriaca Teppner & E. Klein | = | Gymnadenia austriaca (Teppner & E. Klein) P. Delforge |
| Nigritella nigra (L.) Rchb. f. subsp. carpatica | = | Gymnadenia carpatica (Zapal.) Teppner & E.Klein |
| Nigritella nigra (Wettst.) K. Richt. subsp. corneliana | = | Gymnadenia corneliana (Beauverd) Teppner & E. Klein |
| Nigritella nigra (L.) Rchb. f. subsp. gabasiana | = | Gymnadenia gabasiana (Teppner & E.Klein) Teppner & E.Klein |
| Nigritella nigra (L.) Rchb. f. subsp. lithopolitanica (H.Baumann) R.Lorenz | = | Gymnadenia lithopolitanica (Ravnik) Teppner & E.Klein |
| Nigritella nigra (L.) Rchb. f. subsp. rhellicani (Teppner & E. Klein) H. Baumann | = | Gymnadenia rhellicani (Teppner & E. Klein) Teppner & E. Klein |
| Nigritella nigra (L.) Rchb. f. subsp. runei (H.Baumann) R.Lorenz | = | Gymnadenia runei (Teppner & E.Klein) Ericsson |
| Nigritella nigra (L.) Rchb. f. var. rosea Vis. & Sacc. ex Goiran | = | Gymnadenia rhellicani (Teppner & E. Klein) Teppner & E. Klein |
| Nigritella rhellicani Teppner & E. Klein | = | Gymnadenia rhellicani (Teppner & E. Klein) Teppner & E. Klein |
| Nigritella rubra (Wettst.) Richt. | = | Gymnadenia rubra Wettst. |
| Nigritella rubra (L.) Rchb. f. subsp. archiducis-joannis | = | Gymnadenia archiducis-joannis (Teppner & E.Klein) Teppner & E.Klein |
| Nigritella rubra (L.) Rchb. f. subsp. buschmanniae | = | Gymnadenia buschmanniae (Teppner & Ster) Teppner & E.Klein |
| Nigritella rubra (Wettst.) K. Richt. subsp. stiriaca | = | Gymnadenia stiriaca (Rech.) Teppner & E.Klein |
| Nigritella rubra (Wettst.) K. Richt. subsp. widderi | = | Gymnadenia widderi (Teppner & E.Klein) Teppner & E.Klein |
| Nigritella suaveolens W. D. J. Koch | = | Gymnadenia nigra (L.) Rchb. f. |
| Nigritella × wettsteiniana Asch. & Graebn. | = | Gymnadenia × bornmuelleri Dalla Torre & Sarnth. |
| Nigritella widderi Teppner & E. Klein | = | Gymnadenia widderi (Teppner & E. Klein) Teppner & E. Klein |
| Niphantha gelida (Lindl.) Luer | = | Stelis gelida (Lindl.) Pridgeon & M. W. Chase |
| Notylia bicolor Lindl. | = | Macroclinium bicolor (Lindl.) Dodson |
| Notylia conduplicans C. Schweinf. | = | Notylia microchila Cogn. in C. F. P. von Martius & auct. suc. (eds.) |
| Notylia cordesii L. O. Williams | = | Macroclinium cordesii (L. O. Williams) Dodson |
| Notylia lexarzana Hágsater & R. González | = | Macroclinium lexarzanum (Hágsater & R. González) Dodson |
| Notylia manabina Dodson | = | Macroclinium manabinum (Dodson) Dodson |
| Notylia nana Cogn. in I. Urban | = | Notylia angustifolia Cogn. in I. Urban |
| Notylia perryi Dodson | = | Macroclinium perryi (Dodson) Dodson |
| Notylia rosea (Barb. Rodr.) Cogn. | = | Macroclinium roseum Barb. Rodr. |
| Notylia tenuis Lindl. | = | Notylia sagittifera (Kunth) Link |
| Notylia wullschlaegeliana Focke | = | Macroclinium wullschlaegelianum (H. Focke) Dodson |
| Notylia xiphophorus Rchb. f. | = | Macroclinium xiphophorus (Rchb. f.) Dodson |