| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| NEPR2 | Neptunia prostrata (Lam.) Baill. | garden puff | Fabaceae
|
| NEPUF2 | Neptunia pubescens Benth. var. floridana (Small) B.L. Turner | Neptunia pubescens var. pubescens | Fabaceae
|
| NEPUL | Neptunia pubescens Benth. var. lindheimeri (B.L. Robins.) B.L. Turner | Neptunia pubescens var. pubescens | Fabaceae
|
| NEPUM | Neptunia pubescens Benth. var. microcarpa (Rose) Windler | tropical puff | Fabaceae
|
| NEPUP | Neptunia pubescens Benth. var. pubescens | tropical puff | Fabaceae
|
| NEPU3 | Neptunia pubescens Benth. | tropical puff | Fabaceae
|
| NEPTU | Neptunia Lour. | puff | Fabaceae
|
| NEANA | Neraudia angulata Cowan var. angulata | angularfruit ma'oloa | Urticaceae
|
| NEAND | Neraudia angulata Cowan var. dentata O. Deg. & Cowan | angularfruit ma'oloa | Urticaceae
|
| NEAN | Neraudia angulata Cowan | angularfruit ma'oloa | Urticaceae
|
| NECO4 | Neraudia cookii St. John | Neraudia ovata | Urticaceae
|
| NEKA | Neraudia kahoolawensis Hbd. | Neraudia sericea | Urticaceae
|
| NEKAH | Neraudia kauaiensis (Hbd.) Cowan var. helleri Cowan | Neraudia kauaiensis | Urticaceae
|
| NEKA2 | Neraudia kauaiensis (Hbd.) Cowan | Kauai ma'oloa | Urticaceae
|
| NEMEG | Neraudia melastomifolia Gaud. var. gaudichaudii Cowan | Neraudia melastomifolia | Urticaceae
|
| NEMEP | Neraudia melastomifolia Gaud. var. pallida Cowan | Neraudia melastomifolia | Urticaceae
|
| NEMEP2 | Neraudia melastomifolia Gaud. var. parvifolia (Wawra) Hbd. | Neraudia melastomifolia | Urticaceae
|
| NEMEP3 | Neraudia melastomifolia Gaud. var. pubescens Cowan | Neraudia melastomifolia | Urticaceae
|
| NEMEU | Neraudia melastomifolia Gaud. var. uncinata Cowan | Neraudia melastomifolia | Urticaceae
|
| NEME5 | Neraudia melastomifolia Gaud. | ma'aloa | Urticaceae
|
| NEOV | Neraudia ovata Gaud. | Big Island ma'oloa | Urticaceae
|
| NESE2 | Neraudia sericea Gaud. | woodland ma'oloa | Urticaceae
|
| NERAU | Neraudia Gaud. | ma'oloa | Urticaceae
|
| NEBO | Nerine bowdenii W. Watson | | Liliaceae
|
| NERIN | Nerine Herb. | nerine | Liliaceae
|
| NECA3 | Nerisyrenia camporum (Gray) Greene | bicolor fanmustard | Brassicaceae
|
| NELI | Nerisyrenia linearifolia (S. Wats.) Greene | White Sands fanmustard | Brassicaceae
|
| NERIS | Nerisyrenia Greene | fanmustard | Brassicaceae
|
| NEGR4 | Nerium grandiflorum Roxb. ex R. Br. | Cryptostegia grandiflora | Asclepiadaceae
|
| NEOL | Nerium oleander L. | oleander | Apocynaceae
|
| NERIU | Nerium L. | oleander | Apocynaceae
|
| NEGRI | Nertera granadensis (L. f.) Druce var. insularis Skottsberg | Nertera granadensis | Rubiaceae
|
| NEGR2 | Nertera granadensis (L. f.) Druce | makole | Rubiaceae
|
| NERTE | Nertera Banks & Soland. ex Gaertn. | nertera | Rubiaceae
|
| NELO2 | Nesaea longipes Gray | stalkflower | Lythraceae
|
| NESA | Nesaea salicifolia Kunth | Heimia salicifolia | Lythraceae
|
| NESAE | Nesaea Comm. ex Kunth | nesaea | Lythraceae
|
| NEPA3 | Neslia paniculata (L.) Desv. | ballmustard | Brassicaceae
|
| NESLI | Neslia Desv. | neslia | Brassicaceae
|
| NECL2 | Nesolechia cladoniscum (Willey) Fink | Pycnothelia papillaria | Cladoniaceae
|
| NEOX | Nesolechia oxyspora (Tul.) A. Massal. | Phacopsis oxyspora | Lecanoraceae
|
| NETH | Nesolechia thallicola (A. Massal.) A. Massal. | Phacopsis thallicola | Lecanoraceae
|
| NEPO | Nesoluma polynesicum (Hbd.) Baill. | keahi | Sapotaceae
|
| NESOL | Nesoluma Baill. | nesoluma | Sapotaceae
|
| NESA2 | Nestegis sandwicensis (Gray) O.& I. Deg. & L. Johnson | Hawai'i olive | Oleaceae
|
| NESTE | Nestegis Raf. | nestegis | Oleaceae
|
| NEUM | Nestronia umbellula Raf. | leechbrush | Santalaceae
|
| NESTR | Nestronia Raf. | nestronia | Santalaceae
|
| NECR | Neubeckia cristata (Ait.) Alef. | Iris cristata | Iridaceae
|
| NEVE2 | Neubeckia verna (L.) Alef. | Iris verna var. verna | Iridaceae
|
| NELA | Neurodium lanceolatum (L.) F�e | ribbon fern | Polypodiaceae
|
| NEURO4 | Neurodium F�e | ribbon fern | Polypodiaceae
|
| NELO3 | Neurolaena lobata (L.) Cass. | sepi | Asteraceae
|
| NEURO2 | Neurolaena R. Br. | neurolaena | Asteraceae
|
| NEBR4 | Neurolejeunea breutelii (Gottsche) A. Evans | | Lejeuneaceae
|
| NEURO3 | Neurolejeunea (Spruce) Schiffn. | | Lejeuneaceae
|
| NENU3 | Neuroloma nudicaule (L.) DC. | Parrya nudicaulis | Brassicaceae
|
| NEAR2 | Neurophyllodes arboreum (Gray) O. Deg. | Geranium arboreum | Geraniaceae
|
| NEMU4 | Neurophyllodes multiflorum (Gray) O. Deg. & Greenw. | Geranium multiflorum | Geraniaceae
|
| NEOV2 | Neurophyllodes ovatifolium (Gray) O. Deg. & Greenw. | Geranium multiflorum | Geraniaceae
|
| NELA6 | Neuropogon lambii Imshaug | Usnea sphacelata | Parmeliaceae
|
| NESU3 | Neuropogon sulphureus (J. Koenig) Hellbom | Usnea sphacelata | Parmeliaceae
|
| NEAL | Neviusia alabamensis Gray | Alabama snow-wreath | Rosaceae
|
| NECL | Neviusia cliftonii Shevock, Ertter & Taylor | Shasta snow-wreath | Rosaceae
|
| NEVIU | Neviusia Gray | snow-wreath | Rosaceae
|
| NECO10 | Newberrya congesta Torr. | Hemitomes congestum | Monotropaceae
|
| NEAR | Neyraudia arundinacea (L.) Henr. | Madagascar grass | Poaceae
|
| NERE | Neyraudia reynaudiana (Kunth) Keng ex A.S. Hitchc. | silkreed | Poaceae
|
| NEYRA | Neyraudia Hook. f. | neyraudia | Poaceae
|
| NEIM | Nezera imbricata Raf. | Linum imbricatum | Linaceae
|
| NEST3 | Nezera striata (Walt.) Nieuwl. | Linum striatum | Linaceae
|
| NEVI | Nezera virginiana (L.) Nieuwl. | Linum virginianum | Linaceae
|
| NIPH | Nicandra physalodes (L.) Gaertn. | apple of Peru | Solanaceae
|
| NICAN | Nicandra Adans. | nicandra | Solanaceae
|
| NIEL | Nicolaia elatior (Jack) Horan. | Etlingera elatior | Zingiberaceae
|
| NIED | Nicolletia edwardsii Gray | Edwards' hole-in-the-sand plant | Asteraceae
|
| NIOC | Nicolletia occidentalis Gray | Mojave hole-in-the-sand plant | Asteraceae
|
| NICOL | Nicolletia Gray | hole-in-the-sand plant | Asteraceae
|
| NIBE | Nicoteba betonica (L.) Lindau | Justicia betonica | Acanthaceae
|
| NIACM | Nicotiana acuminata (Graham) Hook. var. multiflora (Phil.) Reiche | manyflower tobacco | Solanaceae
|
| NIAC | Nicotiana acuminata (Graham) Hook. | manyflower tobacco | Solanaceae
|
| NIAF | Nicotiana affinis T. Moore | Nicotiana alata | Solanaceae
|
| NIALG | Nicotiana alata Link & Otto var. grandiflora Comes | Nicotiana alata | Solanaceae
|
| NIAL | Nicotiana alata Link & Otto | jasmine tobacco | Solanaceae
|
| NIAT | Nicotiana attenuata Torr. ex S. Wats. | coyote tobacco | Solanaceae
|
| NIBIQ | Nicotiana bigelovii (Torr.) S. Wats. var. quadrivalvis (Pursh) Eastw. | Nicotiana quadrivalvis var. quadrivalvis | Solanaceae
|
| NIBIW | Nicotiana bigelovii (Torr.) S. Wats. var. wallacei Gray | Nicotiana quadrivalvis var. wallacei | Solanaceae
|
| NIBI | Nicotiana bigelovii (Torr.) S. Wats. | Nicotiana quadrivalvis var. bigelovii | Solanaceae
|
| NICL | Nicotiana clevelandii Gray | Cleveland's tobacco | Solanaceae
|
| NIEX | Nicotiana excelsior (J. M. Black) J. M. Black | tobacco | Solanaceae
|
| NIFO | Nicotiana forgetiana Hort. ex Hemsley | tobacco | Solanaceae
|
| NIGL | Nicotiana glauca Graham | tree tobacco | Solanaceae
|
| NIGL2 | Nicotiana glutinosa L. | tobacco | Solanaceae
|
| NILA | Nicotiana langsdorffii Weinm. | Langsdorff's tobacco | Solanaceae
|
| NILO | Nicotiana longiflora Cav. | longflower tobacco | Solanaceae
|
| NIOBO | Nicotiana obtusifolia Mertens & Galeotti var. obtusifolia | desert tobacco | Solanaceae
|
| NIOBP | Nicotiana obtusifolia Mertens & Galeotti var. palmeri (Gray) Kartesz, comb. nov. ined. | desert tobacco | Solanaceae
|
| NIOB | Nicotiana obtusifolia Mertens & Galeotti | desert tobacco | Solanaceae
|
| NIPA | Nicotiana palmeri Gray | Nicotiana obtusifolia var. palmeri | Solanaceae
|
| NIPA2 | Nicotiana paniculata L. | tobacco | Solanaceae
|
| NIPL2 | Nicotiana plumbaginifolia Viviani | Tex-Mex tobacco | Solanaceae
|