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- Naaní'Is (Arkikara) 1806 (35) William Clark
- Shepherdia argentea (Pursh) Nutt.
- Na'bûgogwis'simaün (Chippewa, flat pumpkin) 1928 (40)
- Cucurbita maxima Dcne.
- Nachtkerz or Nachtkerze (German) 1892-1900 (6, 158)
- Oenothera biennis L. [also reported as: Onagra biennis (L.) Scop. ]
- Nackte Aralie (German) 1900 (158)
- Aralia nudicaulis L.
- Nägde (Swedish) 1886 (110)
- Spergula arvensis L.
- Nahaapi nakaaruts (Pawnee, cherry tree) 1919 (37)
- Prunus virginiana L. var. virginiana
[reported as: Padus nana (Du Roi) M. Roemer ]
- Nahata-pahat (Pawnee, red tree) 1919 (37)
- Quercus rubra L.
- Nahosh (Winnebago) 1919 (37)
- Acer negundo L.
- Naiad
- 1938-1942 (120, 155)
- Najas L. [also reported as: Naias L. ]
- 1977 (3)
- Najas flexilis (Willd.) Rostk. & Schmidt
- 1977 (3)
- Najas guadalupensis (Spreng.) Magnus
- 1923 (156)
- Najas marina L.
- Naias 1936 (93) Neb
- Najas L. [reported as: Naias L. ]
- Nail-rod [Nail rod] 1913-1923 (5, 156)
- Symphyotrichum lateriflorum (L.) A.& D. Löve var. lateriflorum [also reported as: Aster hirsuticaulis Lindl., Aster lateriflorus (L.) Britton ]
- Nailwort
- 1900 (158)
- Draba L.
- 1923 (156)
- Draba breweri S. Wats. var. cana (Rydb.) Rollins [reported as: Draba stylaris J. Gay ]
- 1900-Present (4, 50, 138, 155, 158) said to be used for felons and whitlows, diseases of nails and joints of fingers
- Paronychia P. Mill.
- 1913-1923 (5, 156)
- Paronychia canadensis (L.) Wood [also reported as: Paronychia dichotoma (L.) Nutt.]
- Naked barley 1900 (158) varieties of 4-rowed barley
- Hordeum vulgare L.
- Naked beard grass [Naked beard-grass] 1903-1938 (5, 66, 92, 94, 119)
- Gymnopogon ambiguus (Michx.) B.S.P. [also reported as: Gymnopogon racemosus]
- Naked broomrape [Naked broom-rape] 1900-1936 (5, 93, 156, 157, 158)
- Orobanche uniflora L. [also reported as: Thalesia uniflora (L.) Britton ]
- Naked miterwort 1942-Present (50, 155)
- Mitella nuda L.
- Naked-flower tick-trefoil [Nakedflower ticktrefoil, Naked-flowered tick trefoil, Naked-flowered tick-trefoil] 1907-Present (5, 50, 72, 97)
- Desmodium nudiflorum (L.) DC. [also reported as: Meibomia nudiflora (L.) Kuntze ]
- Naked-stem hawksbeard [Naked stemmed hawksbeard] 1899-1913 (5, 131)
- Crepis runcinata (James) Torr. & Gray
- Naked-stlak miterwort [Naked-stlaked miterwort] 1895-1923 (2, 156)
- Mitella nuda L.
- Nakisokiits or nakisu-kiitsu (Pawnee, pine water) 1919 (37)
- Silphium laciniatum L.
- Nakitsu (Pawnee) 1919 (37)
- Maclura pomifera (Raf.) Schneid. [reported as: Toxylon pomiferum Raf. ]
- Nama 1923 (138)
- Nama L.
- Name'pin (Chippewa, sturgeon plant) 1928 (40)
- Asarum canadense L.
- Name'wückons (Chippewa, little sturgeon plant) 1928 (40)
- Pycnanthemum virginianum (L.) T. Dur. & B.D. Jackson ex B.L. Robins. & Fern. [reported as: Koellia virginiana (L.) MacM. ]
- Name'wûskons' (Chippewa) 1928 (40)
- Prunella vulgaris L.
- Namoll (Spanish) 1900 (158)
- Phytolacca americana L. var. americana [reported as: Phytolacca decandra L. ]
- Nanking cherry 1923-Present (50, 112, 138)
- Prunus tomentosa Thunb.
- Nanny bush [Nanny-bush, Nannybush] 1898-1923? (5, 92, 156, 158) obsolete by 1923
- Viburnum lentago L.
- Nannyberry [Nanny-berry]
- 1876-Present (3, 4, 5, 37, 50, 53, 92, 93, 95, 107, 109, 112, 138, 156, 158)
- Viburnum lentago L.
- 1900-1923 (156, 158) misapplied
- Viburnum prunifolium L.
- Nannyberry viburnum 1942 (155)
- Viburnum lentago L.
- Nanny-plum [Nanny plum] 1900-1923 (5, 156, 158) obsolete by 1923
- Viburnum lentago L.
- Nanpashakanak (Winnebago) 1919 (37)
- Gymnocladus dioicus (L.) K. Koch
- Nan-sank (Winnebago, pure or genuine wood) 1919 (37)
- Acer saccharum Marsh.
- Nanshaman (Omaha-Ponca) 1919 (37)
- Viburnum lentago L.
- Nantita (Omaha-Ponca) 1919 (37)
- Gymnocladus dioicus (L.) K. Koch
- Nap-at-noon
- 1900-1923 (5, 156, 158)
- Ornithogalum umbellatum L.
- 1900-1923 (5, 75, 156, 158) Hennepin IL
- Tragopogon porrifolius L.
- Nape 1900-1913 (5, 158)
- Brassica rapa L. var. rapa [also reported as: Brassica campestris L.]
- Napoleon plant 1828-1876 (7, 92)
- Nelumbo lutea Willd. [also reported as: Nelumbium codophyllum Raf., Nelumbium luteum Willd. ]
- Napoleons 1900-1923 (5, 156, 158)
- Trifolium incarnatum L.
- Napošstan (Lakota) 1918?-1970? (121)
- Ratibida pinnata (Vent.) Barnh.
- Napus 421 AD (107)
- Brassica rapa L. var. rapa [reported as: Brassica campestris L. ]
- Nard Americain or Nard D'Amerique (French) 1892-1900 (6, 158)
- Aralia racemosa L.
- Nardus Americanus 1828 (7)
- Aralia nudicaulis L.
- Nardwurzel Aralie (German) 1828 (7)
- Aralia nudicaulis L.
- Narrow beardtongue
- 1986 (4)
- Penstemon angustifolius Nutt. ex Pursh
- 1977 (3)
- Penstemon angustifolius Nutt. ex Pursh var. caudatus (Heller) Rydb.
- Narrow cotton-grass [Narrow cotton grass] 1903 (66)
- Eriophorum gracile W.D.J. Koch var. gracile
- Narrow dock
- 1892-1936 (5, 6, 64, 69, 77, 92, 93, 156, 157, 158)
- Rumex crispus L.
- 1806 (35) Meriwether Lewis
- Rumex salicifolius Weinm.
- Narrow false oat 1913 (5)
- Trisetum spicatum (L.) Richter
- Narrow goosefoot Present (50)
- Chenopodium leptophyllum (Moq.) Nutt. ex S. Wats.
- Narrow melic grass [Narrow melic-grass] 1852-1907 (5, 56, 72, 163)
- Melica mutica Walt.
- Narrow plantain 1912 (62) IN
- Plantago lanceolata L.
- Narrow reed grass 1913 (5)
- Calamagrostis stricta (Timm) Koel. ssp. stricta [reported as: Calamagrostis neglecta (Ehrh.) Gaertn. ]
- Narrow three-tooth grass [Narrow three-toothed grass] 1913-1938 (5, 99, 119)
- Tridens strictus (Nutt.) Nash [also reported as: Triodia stricta (Nutt.) Benth. (sic) ]
- Narrow-cell corn salad [Narrow-celled corn salad] 1913-1937 (5, 97)
- Valerianella radiata (L.) Dufr. [also reported as: Valerianella stenocarpa (Engelm.) Krok. ]
- Narrow-fruit sedge [Narrow-fruited sedge] 1894 (129) SD
- Carex sychnocephala Carey
- Narrow-leaf [Narrow-leaved amsonia] 1937 (97) OK
- Amsonia tabernaemontana Walt. var. salicifolia (Pursh) Woods. [reported as: Amsonia salicifolia Pursh ]
- Narrow-leaf American vetch [Narrow-leaved American vetch] 1907-1937 (5, 72, 93, 97)
- Vicia americana Muhl. ex Willd. ssp. minor (Hook.) C.R. Gunn [also reported as: Vicia linearis (Nutt.) Greene, Vicia sparsifolia Nutt.]
- Narrow-leaf arrowhead [Narrow-leaved arrow-head] 1932 (85) SD
- Sagittaria longiloba Engelm. ex J.G. Sm.
- Narrow-leaf balsam poplar [Narrow-leaved balsam poplar] 1857 (20)
- Populus angustifolia James
- Narrow-leaf beardtongue [Narrow-leaved beard-tongue] 1933 (127) ND
- Penstemon angustifolius Nutt. ex Pursh
- Narrow-leaf bird's-foot trefoil [Narrowleaf bird's-foot trefoil] Present (50)
- Lotus tenuis Waldst. & Kit. ex Willd.
- Narrow-leaf black cottonwood [Narrow-leaved black cottonwood] 1895 (130) SD
- Populus angustifolia James
- Narrow-leaf blue-eyed grass [Narrowleaf blue-eyed grass] Present (50)
- Sisyrinchium angustifolium Mill.
- Narrow-leaf bluet [Narrowleaf bluet] 1977-1986 (3, 4)
- Hedyotis nigricans (Lam.) Fosberg
- Narrow-leaf buckthorn [Narrow-leaved buckthorn] 1895 (2)
- Rhamnus lanceolata Pursh
- Narrow-leaf bur-reed [Narrowleaf bur-reed, Narrowleaf burreed, Narrow-leaved bur-reed] 1913-Present (50, 5, 155)
- Sparganium angustifolium Michx.
- Narrow-leaf cat-tail [Narrowleaf cattail, Narrow-leafed cat-tail, Narrow-leaved cattail, Narrow-leaved cat-tail] 1923-Present (3, 50, 85, 93, 97, 125, 138, 155, 156)
- Typha angustifolia L.
- Narrow-leaf collinsia [Narrow-leaved collinsia] 1913-1937 (5, 65, 97)
- Collinsia violacea Nutt.
- Narrow-leaf collomia [Narrow-leaved collomia] 1899-1936 (5, 93, 131)
- Collomia linearis Nutt.
- Narrow-leaf coneflower [Narrow leaf cone flower]
- 1937 (124) TX
- Echinacea angustifolia DC.
- 1907 (72) IA
- Echinacea angustifolia DC. var. angustifolia [reported as: Brauneria angustifolia (DC.) Heller ]
- Narrow-leaf corn salad [Narrowleaf corn salad] 1937 (122) TX
- Valerianella radiata (L.) Dufr. [reported as: Valerianella stenocarpa (Engelm.) Krok. ]
- Narrow-leaf cotton sedge [Narrowleaf cottonsedge] 1942-1944 (139, 155)
- Eriophorum angustifolium Honckeny ssp. scabriusculum Hultén
- Narrow-leaf cottonwood [Narrowleaf cottonwood, Narrow-leaved cottonwood] 1850-Present (1, 3, 4, 5, 28, 50, 85, 93, 131, 135, 138, 155, 157)
- Populus angustifolia James
- Narrow-leaf dayflower [Narrowleaf dayflower] 1942 (155)
- Commelina erecta L. var. angustifolia (Michx.) Fern. [reported as: Commelina angustifolia Michx. ]
- Narrow-leaf dock [Narrowleaf dock, Narrow-leaved dock]
- 1932 (85) SD
- Rumex salicifolius Weinm. var. mexicanus (Meisn.) A.S. Hitchc [reported as: Rumex mexicanus Meisn. ]
- Present (50)
- Rumex stenophyllus Ledeb.
- Narrow-leaf eriogonum [Narrow-leaved eriogonum] 1913 (5)
- Eriogonum brevicaule Nutt. var. brevicaule [reported as: Eriogonum campanulatum Nutt. ]
- Narrow-leaf evening-primrose [Narrow-leaved evening primrose] 1977-1986 (3, 4)
- Oenothera linifolia Nutt.
- Narrow-leaf false dragonhead [Narrowleaf false dragonhead] Present (50)
- Physostegia angustifolia Fern.
- Narrow-leaf four-o'clock [Narrowleaf four-o'clock] 1986-Present (4, 50)
- Mirabilis linearis (Pursh) Heimerl
- Narrow-leaf germander [Narrow-leaved germander] 1913-1937 (5, 97)
- Teucrium canadense L. var. canadense
[also reported as: Teucrium littorale Bickn. ]
- Narrow-leaf globe-mallow [Narrow-leaf globe mallow, Narrowleaf globemallow] 1942-1986 (3, 4, 155)
- Sphaeralcea angustifolia (Cav.) G. Don
- Narrow-leaf glossy buckthorn [Narrowleaf glossy buckthorn] 1942 (155)
- Frangula alnus P. Mill. [reported as: Rhamnus frangula L. var. angustifolia Loud. ]
- Narrow-leaf gold-aster [Narrowleaf goldaster] 1942 (155)
- Heterotheca stenophylla (Gray) Shinners var. stenophylla [reported as: Chrysopsis scabrifolia A. Nels. ]
- Narrow-leaf goldenrod [Narrow-leaved golden-rod]
- 1933 (127) ND
- Euthamia graminifolia (L.) Nutt.
- 1977 (3)
- Euthamia graminifolia (L.) Nutt. var. graminifolia [reported as: Solidago graminifolia (L.) Salisb. var. graminifolia, Solidago graminifolia (L.) Salisb. var. major (Michx.) Fern. ]
- 1977 (3)
- Euthamia gymnospermoides Greene [reported as: Solidago graminifolia (L.) Salisb. var. gymnospermoides (Greene) Croat, Solidago graminifolia (L.) Salisb. var. media (Greene) S.K. Harris ]
- Narrow-leaf goosefoot[Narrowleaf goosefoot, Narrow-leaved goosefoot] 1899-1937 (5, 93, 97, 122, 131)
- Chenopodium leptophyllum (Moq.) Nutt. ex S. Wats.
- Narrowleaf gromwell 1942 (155)
- Lithospermum incisum Lehm. [reported as: Lithospermum angustifolium Michx. ]
- Narrow-leaf gum plant [Narrow-leaved gum-plant] 1913-1937 (5, 97)
- Grindelia lanceolata Nutt.
- Narrow-leaf gumweed [Narrowleaf gumweed] 1937-Present (50, 122) TX
- Grindelia lanceolata Nutt.
- Narrow-leaf hawk's-beard [Narrowleaf hawksbeard, Narrow-leaved hawksbeard] 1913-Present (5, 50, 155)
- Crepis tectorum L.
- Narrow-leaf hawkweed [Narrowleaf hawkweed, Narrow-leaved hawkweed] 1899-Present (5, 50, 93, 131, 155)
- Hieracium umbellatum L. [also reported as: Hieracium scabriusculum Schwein. ]
- Narrow-leaf horse-gentian [Narrowleaf horsegentian, Narrow-leaved horse-gentian, Narrow-leaved horse gentian] 1907-1942 (5, 72, 155, 156)
- Triosteum angustifolium L.
- Narrow-leaf houstonia [Narrow-leaved houstonia] 1907-1937 (5, 72, 93, 97)
- Hedyotis nigricans (Lam.) Fosberg var. nigricans [also reported as: Houstonia angustifolia Michx. ]
- Narrow-leaf Indian breadroot [Narrowleaf Indian breadroot] Present (50)
- Pediomelum linearifolium (Torr. & Gray) J. Grimes
- Narrow-leaf ironweed [Narrow-leaved ironweed] 1936 (93) Neb
- Vernonia marginata (Torr.) Raf.
- Narrow-leaf knotweed [Narrowleaf knotweed, Narrow-leaved knotweed] 1913-Present (5, 50, 122) TX
- Polygonum bellardii All. [also reported as: Polygonum neglectum Besser ]
- Narrow-leaf leafy spurge 1986 (4)
- Euphorbia esula L. var. uralensis (Fisch. ex Link) Dorn [reported as: Euphorbia uralensis Fisch. ex Link ]
- Narrow-leaf marshallia [Narrow-leaved marshallia] 1913-1937 (5, 97)
- Marshallia caespitosa Nutt.
- Narrow-leaf marsh-elder [Narrowleaf marshelder, Narrowleaf marsh elder, Narrow-leaved marsh elder] 1937-Present (50, 97, 122)
- Iva angustifolia Nutt.
- Narrow-leaf meadow grass [Narrow-leaved meadow grass] 1770 (41)
- Poa pratensis L. ssp. pratensis [reported as: Poa angustifolia L. ]
- Narrow-leaf meadowsweet [Narrowleaf meadowsweet, Narrow-leaved meadow sweet] 1942 (155)
- Spiraea alba Du Roi
- Narrow-leaf milkvetch [Narrowleaf milkvetch, Narrow-leaved milk vetch] 1913-Present (50, 5, 93)
- Astragalus pectinatus (Hook.) Dougl. ex G. Don
- Narrow-leaf milkweed [Narrowleaf milkweed, Narrow-leafed milkweed, Narrow-leaved milkweed] 1899-1986 (3, 4, 5, 85, 93, 97, 122, 131)
- Asclepias stenophylla Gray [also reported as: Acerates angustifolia(Nutt.) Dcne.]
- Narrow-leaf morning-glory [Narrowleaf morning-glory] Present (50)
- Ipomoea shumardiana (Torr.) Shinners
- Narrow-leaf mountain-mint [Narrowleaf mountainmint, Narrow-leaved mountain mint] 1930-Present (50, 106)
- Pycnanthemum tenuifolium Schrad. [also reported as: Pycnanthemum flexuosum ]
- Narrow-leaf paleseed [Narrowleaf paleseed] Present (50)
- Leucospora multifida (Michx.) Nutt.
- Narrow-leaf pectis [Narrowleaf pectis] Present (50)
- Pectis angustifolia Torr. var. angustifolia
- Narrow-leaf penstemon [Narrowleaf penstemon] 1923-1942 (138, 155)
- Penstemon angustifolius Nutt. ex Pursh
- Narrow-leaf pepper-grass [Narrow-leaved pepper grass] 1913 (5)
- Lepidium ruderale L.
- Narrow-leaf pinweed [Narrowleaf pinweed, Narrow-leaved pin-weed] 1907-Present (5, 50, 72, 93, 97)
- Lechea tenuifolia Michx. [also reported as: Lechia tenuifolia Michx. ]
- Narrow-leaf plantain [Narrowleaf plantain, Narrow-leaved plantain] 1896-Present (45, 50, 156)
- Plantago lanceolata L.
- Narrow-leaf poison milkvetch [Narrowleaf poisonmilkvetch] 1942 (155)
- Astragalus pectinatus (Hook.) Dougl. ex G. Don
- Narrow-leaf poisonvetch [Narrow-leaved poisonvetch] 1977 (3)
- Astragalus pectinatus (Hook.) Dougl. ex G. Don
- Narrow-leaf pondweed [Narrowleaf pondweed] Present (50)
- Potamogeton strictifolius Benn.
- Narrow-leaf poplar [Narrowleaf poplar, Narrow-leafed poplar, Narrow-leaved poplar] 1850-1942 (28, 112, 155)
- Populus angustifolia James
- Narrow-leaf psoralea [Narrow-leaved psoralea] 1913-1937 (5, 93, 97)
- Pediomelum linearifolium (Torr. & Gray) J. Grimes [also reported as: Psoralea linearifolia Torr. & Gray ]
- Narrow-leaf puccoon [Narrow leaf puccoon, Narrow-leaved puccoon] 1899-1937 (3, 5, 72, 93, 97, 98, 121, 124, 127, 131, 156)
- Lithospermum incisum Lehm. [also reported as: Lithospermum angustifolium Michx., Lithospermum linearifolium Goldie ]
- Narrow-leaf purple coneflower [Narrowleaf purplecone flower, Narrow-leaved purple cone-flower] 1898-1937 (5, 37, 49, 53, 97, 122)
- Echinacea angustifolia DC.
- Narrow-leaf rhombopod [Narrowleaf rhombopod] Present (50)
- Cleomella angustifolia Torr.
- Narrow-leaf sedge [Narrowleaf sedge, Narrow-leaved sedge] 1907-1977 (3, 5, 72)
- Carex amphibola Steud. [also reported as: Carex amphibola Steud. var. turgida Fern. ]
- Narrow-leaf showy goldenrod [Narrow-leaved showy goldenrod] 1930 (82) IA
- Solidago speciosa Nutt. var. rigidiuscula Torr. & Gray [reported as: Solidago speciosa Nutt. var. angustata Torr. & Gray ]
- Narrow-leaf sneezeweed [Narrow-leaved sneezeweed] 1930 (106)
- Helenium amarum (Raf.) H. Rock var. amarum [reported as: Helenium tenuifolium Nutt. ]
- Narrow-leaf spleenwort [Narrowleaf spleenwort, Narrow-leaved spleenwort] 1913-1942 (5, 138, 155)
- Diplazium pycnocarpon (Spreng.) Broun [also reported as: Athyrium pycnocarpon (Spreng) Tidest., Asplenium pycnocarpon Spreng. ]
- Narrow-leaf stenotus [Narrow-leaved stenotus] 1913 (5)
- Stenotus armerioides Nutt.
- Narrow-leaf stoneseed [Narrowleaf stoneseed] Present (50)
- Lithospermum incisum Lehm.
- Narrow-leaf sumpweed [Narrowleaf sumpweed] 1942 (155)
- Iva angustifolia Nutt.
- Narrow-leaf sunflower [Narrow-leaved sunflower] 1933 (127) ND
- Helianthus maximiliani Schrad.
- Narrow-leaf tetraneuris [Narrow-leaved tetraneuris] 1913 (5)
- Tetraneuris scaposa (DC.) Greene var. scaposa [reported as: Tetraneuris stenophylla Rydb. ]
- Narrow-leaf trefoil [Narrow-leaved trefoil] 1986 (4)
- Lotus tenuis Waldst. & Kit. ex Willd.
- Narrow-leaf umbrella-wort [Narrow-leaved umbrella wort, Narrow-leaved umbrella-wort, Narrow-leaved umbrellawort] 1899-1937 (5, 93, 97, 131)
- Mirabilis linearis (Pursh) Heimerl [also reported as: Alliona linearis Pursh ]
- Narrow-leaf verbena [Narrow-leaved verbena] 1977-1986 (3, 4)
- Verbena simplex Lehm.
- Narrow-leaf vervain [Narrowleaf vervain, Narrow-leaved vervain] 1912-Present (5, 50, 62, 82, 93, 97)
- Verbena simplex Lehm. [also reported as: Verbena angustifolia Michx. ]
- Narrow-leaf vetch [Narrowleaf vetch, Narrow-leaved vetch]
- 1899-1932 (85, 131)
- Vicia americana Muhl. ex Willd. ssp. minor (Hook.) C.R. Gunn [also reported as: Vicia linearis (Nutt.) Greene, Vicia sparsifolia Nutt.]
- 1942-1949 (109, 155)
- Vicia sativa L. ssp. nigra (L.) Ehrh. [also reported as: Vicia angustifolia L. ]
- Narrow-leaf Virginia thyme [Narrow-leaf virginian thyme, Narrow-leaved Virginia thyme] 1840-1876 (19, 92)
- Pycnanthemum virginianum (L.) T. Dur. & B.D. Jackson ex B.L. Robins. & Fern. [also reported as: Pycnanthemum virginicum (possibly this species)]
- Narrow-leaf wafer-ash [Narrow-leafed wafer ash, Narrow-leaved wafer-ash] 1937 (124) TX
- Ptelea trifoliata L. ssp. trifoliata var. trifoliata [reported as: Ptelea baldwinii Torr. & Gray ]
- Narrow-leaf water-parsnip [Narrow-leaved water parsnip, narrow-leaved water-parsnip] 1900-1913 (5, 158)
- Berula erecta (Huds.) Coville
- Narrow-leaf water-plantain [Narrowleaf water plantain] Present (50)
- Alisma gramineum Lej.
- Narrow-leaf waterweed [Narrowleaf waterweed, Narrow-leafed water-weed]
- 1942 (155)
- Elodea canadensis Michx. [reported as: Anacharis linearis [Vict. ] , Elodea linearis (Rydb.) St. John]
- 1913 (5)
- Elodea nuttallii (Planch.) St. John [reported as: Philotria angustifolia (Muhl.) Britton ]
- Narrow-leaf wild leek [Narrowleaf wild leek] Present (50)
- Allium burdickii (Hanes) A. G. Jones
- Narrow-leaf willow [Narrow leaf willow, Narrowleaf willow, Narrow-leaved willow]
- 1806-Present (35, 50, 101) Meriwether Lewis
- Salix exigua Nutt.
- 1895-1923 (5, 101, 130, 156, 158)
- Salix interior Rowlee [also reported as: Salix fluviatilis Nutt., Salix longifolia Muhl. ]
- Narrow-leaf willow herb [Narrow-leaved willow herb]
- 1977-1986 (3, 4)
- Epilobium leptophyllum Raf.
- 1892 (6)
- Epilobium palustre L.
- Narrow-leaf wire-lettuce [Narrowleaf wirelettuce] Present (50)
- Stephanomeria minor (Hook.) Nutt. var. minor
- Narrow-petal stonecrop [Narrow-petaled stonecrop] 1913-1936 (5, 93)
- Sedum lanceolatum Torr. [also reported as: Sedum stenopetalum Pursh ]
- Narrow-point knotweed [Narrow-pointed knotweed] 1913 (5)
- Polygonum ramosissimum Michx. [reported as: Polygonum leptocarpum Robinson ]
- Narrow-seed spurge [Narrowseeded spurge, Narrow-seeded spurge] 1899-1937 (5, 93, 97, 122, 131)
- Chamaesyce stictospora (Engelm.) Small[also reported as: Euphorbia stictospora Engelm. ]
- Narrow-tip spike-sedge [Narrow-tip spikesedge] 1944 (139) CO
- Eleocharis compressa Sullivant [reported as: Eleocharis acuminata (Muhl.) Nees.]
- Narrow-top feather grass [Narrow-topped feather-grass] 1901 (94)
- Achnatherum occidentale (Thurb. ex S. Watson) Barkworth [reported as: Stipa oregonensis Scribn. ]
- Nash snakeroot [Nash snake root] 1937 (122, 124) TX
- Aristolochia serpentaria L.
- Nas-sãn (Monominie) 1810 (23)
- Urtica L. [reported as: Urtica (Tourn.) L. ]
- Nasturtium
- 1919 (107)
- Lepidium sativum L.
- 1876 (92)
- Rorippa nasturtium-aquaticum (L.) Hayek [reported as: Nasturtium officinale]
- Nasturtium oxalis 1923 (138)
- Oxalis corniculata L. [reported as: Oxalis corniculata atropurpurea ]
- Nasula jazanpi ipije (Lakota, no appetite cure) 1918?-1970? (121)
- Artemisia frigida Willd.
- Natakaaru (Pawnee) 1919 (37)
- Populus deltoides Bartr. ex Marsh. ssp. monilifera (Aiton) Eckenwalder [reported as: Populus sargentii Dode. ]
- Naterwurtz (German) 1879 (46)
- Polygonum amphibium L.
- National rose 1923 (138)
- Rosa multiflora Thunb. ex Murray [reported as: Rosa gentiliana , Rosa cathayensis (Rehder & E.H. Wilson) L.H. Bailey]
- Native plum 1900-1913 (5, 158)
- Prunus americana Marsh.
- Native red-osier dogwood 1937 (112) Neb
- Cornus sericea L. ssp. sericea [reported as: Cornus stolonifera Michx.]
- Native timothy 1884-1896 (45, 87)
- Phleum alpinum L.
- Native wild crab apple 1937 (112) Neb
- Malus ioensis (Wood) Britton
- Natterkopf (German) 1900 (158)
- Echium vulgare L.
- Nattourne 1879 (46)
- Zizania aquatica L.
- Natural grass
- 1913 (5)
- Poa pratensis L.
- 1913 (5)
- Poa trivialis L.
- Natural-grass [Natural grass] 1900-1913 (5, 158)
- Medicago lupulina L.
- Nature's-mistake [Nature's mistake] 1844-1923? (5, 75, 156, 158) Abington Mass, obsolete by 1923
- Cornus florida L. [also reported as: Cynoxylon floridum (L.) Raf. ]
- Naughty-man's-playing 1900-1929 (157, 158)
- Urtica dioica L.
- Navaho tea Present (50)
- Thelesperma subnudum Gray var. marginatum (Rydb.) T.E. Melchert ex Cronq.
- Navelwort 1900 (158)
- Myriophyllum spicatum L.
- Navette (French) 1919 (107)
- Brassica rapa L. var. rapa [reported as: Brassica campestris L.]
- Navette d'hiver (French) 1919 (107)
- Brassica rapa L. var. rapa [reported as: Brassica campestris L. ]
- Naze-ni pezhi (Omaha-Ponca, milkweed) 1919 (37)
- Chamaesyce serpyllifolia (Pers.) Small
- Near navarretia Present (50)
- Navarretia intertexta (Benth.) Hook. ssp. propinqua (Suksdorf) Day
- Nebraska aster 1913-1936 (5, 50, 93)
- Symphyotrichum praealtum (Poir.) Nesom var. nebraskense (Britton) Nesom [also reported as: Aster nebraskensis Britton ]
- Nebraska blazing star Present (50)
- Liatris punctata Hook. var. nebraskana Gaiser
- Nebraska glorybind 1942 (155)
- Convolvulus arvensis L. [reported as: Convolvulus incanus Vahl. ]
- Nebraska lupine 1913-Present (4, 5, 50, 93, 97, 155)
- Lupinus plattensis S. Wats.
- Nebraska psoralea 1913-1936 (5, 93)
- Pediomelum argophyllum (Pursh) J. Grimes
[also reported as: Psoralea collina Rydb.]
- Nebraska sedge 1913-Present (5, 50, 139, 155)
- Carex nebraskensis Dewey [also reported as: Carex nebrascensis Dewey ]
- Nebraska tansy-aster [Nebraska tansyaster] Present (50)
- Machaeranthera canescens (Pursh) Gray ssp. glabra (Gray) B.L. Turner
- Nebraska thistle 1913-1936 (5, 93)
- Cirsium canescens Nutt. [also reported as: Cirsium nebraskense Britton ]
- Necklace poplar
- 1900-1923 (5, 156, 158)
- Populus deltoides Bartr. ex Marsh.
- 1932 (1)
- Populus deltoides Bartr. ex Marsh. ssp. deltoides [reported as: Populus virginiana Foug. ]
- 1876-1895 (92, 130)
- Populus deltoides Bartr. ex Marsh. ssp. monilifera (Aiton) Eckenwalder [also reported as: Populus monilifera [Aiton] ]
- Necklace sedge
- 1913-Present (5, 50)
- Carex projecta Mackenzie
- 1907-Present (5, 50, 72)
- Carex vesicaria L. var. monile (Tuckerman) Fern. [also reported as: Carex monile Tuckerm. ]
- Necklace-pod [Necklacepod] Present (50)
- Sophora L.
- Necklaceweed [Necklace weed, Necklace-weed]
- 1896 (76) ME
- Actaea L.
- 1840-1923 (5, 19, 49, 92, 156, 158)
- Actaea pachypoda Ell. [also reported as: Actaea alba (Aiton) Willd. ]
- Neckweed [Neck-weed]
- 1898-1929 (5, 92, 156, 157, 158)
- Cannabis sativa L.
- 1840 (19)
- Veronica agrestis L.
- 1897-Present (2, 5, 50, 62, 80, 82, 131, 145, 156, 158)
- Veronica peregrina L.
- Nectarine 1768-1876 (92, 165)
- Prunus persica (L.) Batsch [also reported as: Amygdalus persica L. ]
- Needle-and-thread [Needle and thread, Needelandthread] or Needle-and-thread grass [Needle and thread grass, Needle-and-thread-grass]
- Present (50)
- Hesperostipa (Elias) Barkworth
- 1852-Present (3, 50, 98, 122, 163, 140, 146, 155)
- Hesperostipa comata (Trin. & Rupr.) Barkworth [also reported as: Stipa comata Trin. & Rupr. ]
- Needle beak-sedge [Needle beaksedge] Present (50)
- Rhynchospora capillacea Torr.
- Needle grass [Needlegrass, Needle-grass]
- Present (50)
- Achnatherum Beauv.
- 1912 (152) NM
- Aristida L.
- 1913 (5)
- Aristida adscensionis L.. [reported as: Aristida fasciculata Torr. ]
- 1939-1986 (3, 148, 155)
- Hesperostipa (Elias) Barkworth [also reported as: Stipa L. ]
- 1830-1970 (37, 56, 93, 116, 121)
- Hesperostipa spartea (Trin.) Barkworth [also reported as: Stipa spartea Trin. ]
- 1912 (152) NM
- Scleropogon brevifolius Phil.
- 1894-1944 (5, 56, 93, 94, 111, 115, 126, 129, 140)
- Hesperostipa comata (Trin. & Rupr.) Barkworth [also reported as: Stipa comata Trin. & Rupr. ]
- Needle spike-rush [Needle spike rush, Needle spikerush] 1907-Present (50, 5, 72, 156)
- Eleocharis acicularis (L.) Roemer & J.A. Schultes
- Needle spike-sedge [Needle spikesedge] 1944-1977 (3, 139)
- Eleocharis acicularis (L.) Roemer & J.A. Schultes
- Needle-chervil [Needle chervil] 1913-1923? (5, 156) obsolete by 1923
- Scandix pecten-veneris L.
- Needle-leaf gilia [Needle-leaved gilia] 1913-1937 (5, 97)
- Gilia rigidula Benth. [also reported as: Gilia acerosa (Gray) Britton ]
- Needle-leaf sedge [Needleleaf sedge] 1942-Present (3, 50, 139, 155)
- Carex duriuscula C.A. Mey. [also reported as: Carex eleocharis Bailey ]
- Needle-palm [Needle palm] 1919 (107)
- Yucca filamentosa L.
- Needle-pod rush [Needlepod rush] Present (50)
- Juncus scirpoides Lam.
- Needle-tip blue-eyed grass [Needletip blue-eyed grass Present (50)
- Sisyrinchium mucronatum Michx.
- Neele 1900 (158)
- Lolium temulentum L.
- Neglected life-everlasting 1840 (19)
- Pseudognaphalium macounii (Greene) Kartesz [reported as: Gnaphalium decurrens Ives ]
- Negro corn 1876-1919 (92, 107)
- Sorghum bicolor (L.) Moench ssp. bicolor [also reported as: Sorghum vulgare]
- Negundo 1688 (109) John Ray
- Acer negundo L.
- Nelle 1929 (157)
- Lolium temulentum L.
- Nelson's larkspur 1913 (5)
- Delphinium nuttallianum Pritz ex. Walp.
[reported as: Delphinium nelsoni Greene, Delphinium nelsonii Greene ]
- Nelson's plane-leaf willow [Nelson planeleaf willow] 1942 (155)
- Salix planifolia Pursh [reported as: Salix planifolia Pursh var. nelsonii (Ball) Ball ex E.C. Sm. ]
- Nelumbo
- 1849 (13)
- Nelumbo Adans. [reported as: Nelumbium Juss. ]
- 1930 (82) IA
- Nelumbo lutea Willd.
- Nelumbo jaune (French) 1828 (7)
- Possibly,Nelumbo lutea Willd. [reported as: Nelumbium luteum Juss.]
- Nemastylis 1900 (158)
- Nemastylis Nutt.
- Nemu (Japan) 1919 (107)
- Albizia julibrissin Durazz.
- Nemwatik (Chippewa) 1932 (105)
- Cornus florida L.
- Nenuphar odorant (French) 1828 (7)
- Nymphaea odorata Aiton
- Nep 1913 (5)
- Nepeta cataria L.
- Nepal barley 1919 (107)
- Hordeum vulgare L.
- Nepe 1617 (46)
- Nepeta cataria L.
- Nepesha (Oregon and Western tribes) 1828 (7)
- Asclepias L.
- Nepeta
- 1919 (107)
- Glechoma hederacea L. [reported as: Nepeta glechoma Benth. ]
- 1923-1942 (138, 155)
- Nepeta L.
- Nephritic plant 1876-1900 (92, 158)
- Parthenium integrifolium L.
- Nephrodium felix-mas 1869 (58)
- Dryopteris filix-mas (L.) Schott [reported as: Aspidium filix mas ]
- Nepin-minan (Chipewa for summer berry) 1806-1919 (35, 37)
- Viburnum opulus L.
- Neprun purgatif (French) 1900 (158)
- Rhamnus cathartica L.
- Neptunia 1900-1942 (4, 155, 158)
- Neptunia Lour.
- Nerprun (French) 1892 (6)
- Rhamnus cathartica L. [reported as: Rhamnus catharticus L. ]
- Nerve root [Nerve-root] 1900-1923 (5, 64, 156, 158)
- Cypripedium reginae Walt. [also reported as: Cypripedium hirsutum Mill ]
- Nerved manna grass 1884-1907 (5, 56, 66, 72, 87, 90, 129)
- Glyceria striata (Lam.) A.S. Hitchc. [also reported as: Glyceria nervata Trin., Panicularia nervata (Willd.) Kuntze ]
- Nerved meadow grass [Nerved-manna-grass, Nerved manna-grass] 1852-1938 (87, 88, 90, 119, 143, 163)
- Glyceria striata (Lam.) A.S. Hitchc. [also reported as: Glyceria nervata Trin.]
- Nest plant 1892 (6)
- Monotropa uniflora L.
- Nest-root [Nest root, Nestroot] 1828-1900 (7, 92, 158)
- Monotropa uniflora L.
- Net-leaf hackberry [Netleaf hackberry] 1942-Present (3, 4, 50, 155)
- Celtis laevigata Willd. var. reticulata (Torr.) L. Benson [also reported as: Celtis laevigata Willd. var. reticulata (Torr.) L. Benson, Celtis reticulata Torr. ]
- Nettle
- 1814-Present (1, 4, 7, 10, 50, 82, 93, 155, 158, 167)
- Urtica L. [also reported as: Urtica (Tourn.) L. ]
- 1893-1922 (22, 49, 52, 53, 57, 92, 107)
- Urtica dioica L.
- 1860-1939 (40, 80, 82, 85, 101, 145, 148, 160)
- Urtica dioica L. ssp. gracilis (Aiton) Seland. [also reported as: Urtica gracilis Aiton, Urtica viridis Rydb. ]
- Nettle hemp 1900-1923 (5, 156, 158)
- Galeopsis bifida Boenn. [also reported as: Galeopsis tetrahit L. ]
- Nettle tree [Nettle-tree]
- 1818-1900 (2, 7, 8, 10, 158)
- Celtis L. [also reported as: Celtis (Tourn.) L. ]
- 1770-1923 (5, 27, 34, 41, 92, 107, 156)
- Celtis occidentalis L. [also reported as: Celtis crassifolia Lam. ]
- Nettle-leaf goosefoot [Nettleleaf goosefoot, Nettle-leaved goosefoot] 1907-Present (50, 62, 72, 97, 133)
- Chenopodium murale L.
- Nettle-leaf vervain [Nettle leaf vervain, Nettle leaved vervain, Nettle-leaved vervain] 1840-1986 (3, 4, 5, 19, 48, 80, 92, 93, 95, 156, 157, 158)
- Verbena urticifolia L.
- Nettle-leaved bellflower 1840 (19)
- Possibly,Campanula rapunculoides L. [reported as: Campanula urticaefolia W.]
- Nettle-potato [Nettle potatoe, Nettle potato] 1900-1923 (5, 64, 156, 158)
- Stillingia sylvatica Garden ex L.
- Nevada blue grass [Nevada blue-grass, Nevada bluegrass] 1901-1942 (94, 146, 155)
- Poa secunda J. Presl [also reported as: Poa nevandensis Scribn. ]
- Nevada bulrush 1942-Present (50, 155)
- Scirpus nevadensis S. Wats.
- Nevis wild crab 1931 (137) SD
- Malus ioensis (Wood) Britton
- New England aster [NewEngland aster] 1899-Present (3, 4, 5, 50, 62, 72, 82, 85, 93, 97, 109, 127, 131, 138, 155, 156, 158)
- Symphyotrichum novae-angliae (L.) Nesom [also reported as: Aster novae-angliae L. ]
- New England bentgrass [New England bent grass] 1913-Present (5, 50)
- Agrostis perennans (Walt.) Tuckerman [also reported as: Agrostis oreophila Trin.]
- New England blue violet 1913-Present (5, 50)
- Viola novae-angliae House.
- New England boxwood [New England box-wood] 1892-1900 (6, 158)
- Cornus florida L.
- New England daisy 1671 (46) Josselyn
- Erigeron pulchellus Michx. [reported as: Erigeron bellidifolium Muhl. ]
- New Jersey tea [New-Jersey-tea]
- 1818-1936 (1, 10, 13, 15, 93)
- Ceanothus L.
- 1869-Present (3, 4, 5, 15, 19, 49, 50, 52, 53, 54, 57, 58, 65, 72, 82. 92, 95, 97, 104, 105, 106, 107, 109, 113, 122, 124, 156, 157, 158)
- Ceanothus americanus L. [also reported as: Ceanothus americanus L. var. pitcheri Torr. & Gray ]
- 1928-1986 (3, 4, 40, 85)
- Ceanothus herbaceus Raf. [also reported as: Ceanothus herbaceus Raf. var. pubescens (Torr. & Gray ex S. Wats.) Shinners, Ceanothus ovatus Desf.(possibly Ceanothus herbaceus ]
- New Jersey tea shrub 1882 (14)
- Ceanothus americanus L.
- New Jersey tea tree [New-Jersey tea-tree] 1785 (8)
- Ceanothus americanus L.
- New Mexican checker-mallow [Newmexican checkermallow] 1942 (155)
- Sidalcea neomexicana Gray
- New Mexican hop [NewMexican hop] 1923-1942 (138, 155)
- Humulus lupulus L. var. neomexicanus A. Nels. & Cockerell [also reported as: Humulus lupulus neomexicanus ]
- New Mexican sagebrush 1942 (155)
- Artemisia ludoviciana Nutt. ssp. mexicana (Willd. ex Spreng.) Keck [reported as: Artemisia neomexicana Greene ex Rydb. ]
- New Mexico beeblossom Present (50)
- Gaura neomexicana Woot.
- New Mexico bluestem [NewMexico bluestem] 1942 (155)
- Schizachyrium scoparium (Michx.) Nash var. scoparium [reported as: Andropogon scoparius Michx. var. neomexicanus (Nash) A.S. Hitchc.]
- New Mexico cliff fern Present (50)
- Woodsia neomexicana Windham
- New Mexico feather grass [New Mexico feather-grass, New Mexico feathergrass] 1901-Present (3, 50, 94, 122, 140, 155)
- Hesperostipa neomexicana (Thurb. ex Coult.) Barkworth [also reported as: Stipa neomexicana (Thurb.) Scribn. ]
- New Mexico love grass [NewMexico lovegrass] 1942 (155)
- Eragrostis mexicana (Hornem.) Link ssp. mexicana [reported as: Eragrostis neo-mexicana Vasey ]
- New Mexico pinyon 1900 (158)
- Pinus edulis Engelm.
- New Mexico Spanish bayonet Present (50)
- Yucca harrimaniae Trel. var. neomexicana (Woot. & Standl.) Reveal
- New Mexico stipa 1912 (152) NM
- Hesperostipa neomexicana (Thurb. ex Coult.) Barkworth [reported as: Stipa neo-mexicana (Thurb.) Scribn. ]
- New Mexico yucca [NewMexican yucca] 1942 (155)
- Yucca harrimaniae Trel. var. neomexicana (Woot. & Standl.) Reveal [reported as: Yucca neomexicana Woot. & Standl. ]
- New river thorn 1913 (5)
- Crataegus succulenta Schrad. ex Link [reported as: Crataegus neofluvialis Ashe ]
- New World annual gentian [NewWorld annual gentian] Present (50)
- Gentianella amarella (L.) Boerner ssp. acuta (Michx.) J. Gillett [reported as: Gentiana plebeja Ledeb. ex Spreng. ]
- New Zealand spinach [New-Zealand-spinach] 1895-Present (15, 50, 92, 107, 109, 110, 138) brought by Capt. Cook from New Zealand and used like spinach greens
- Tetragonia tetragonioides (Pallas) Kuntze [also reported as: Tetragonia expansa Murray ]
- Newcastle thorn 1893-1913 (5, 74, 158) NY
- Crataegus crus-galli L.
- Newfoundland spruce 1785 (8)
- Picea glauca (Moench) Voss [reported as: Pinus-abies canadensis ]
- Nez-coupé (French) 1785 (8)
- Staphylea L.
- Nez-coupé à feuilles ternée (French) 1785 (8)
- Staphylea trifolia L.
- Niashiga makan (Omaha-Ponca, human-being medicine) 1919 (37)
- Cucurbita foetidissima Kunth [reported as: Pepo foetidissima (Kunth) Britton ]
- Nicandra Present (50) for Nicandra poet of Colophon who wrote on plants about 100 BC
- Nicandra Adans.
- Nickar tree [Nickar-tree, Nicker tree, Nicker-tree]
- 1785 (8)
- Caesalpinia L.[reported as: Guilandina L. ]
- 1785-1923 (6, 7, 8, 92, 107, 156) misapplied
- Gymnocladus dioicus (L.) K. Koch [also reported as: Guilandina dioica L., Gymnocladus canadensis) Lam ]
- Nicker Present (50)
- Caesalpinia L.
- Nicker-nut 1923 (156) misapplied
- Gymnocladus dioicus (L.) K. Koch [reported as: Gymnocladus canadensis Lam. ]
- Nickle-leaf milkvetch [Nickleleaf milkvetch] 1942 (155)
- Astragalus agrestis Dougl. ex G. Don [reported as: Astragalus goniatus Nutt.]
- Nickweed [Nick-weed] 1900-1929 (157, 158)
- Cannabis sativa L.
- Nicollet's cinquefoil 1913 (5)
- Potentilla paradoxa Nutt. [reported as: Potentilla nicolletii (S. Wats.) Sheldon ]
- Nido (Sioux) 1852 (47)
- Apios americana Medik. [reported as: Apios tuberosa Moench ]
- Nidsida (Osage) 1918?-1970? (121)
- Monarda fistulosa L.
- Niessenkraut (German) 1828 (7)
- Helenium autumnale L.
- Night rocket 1923 (156)
- Hesperis matronalis L.
- Night willow-herb [Night willow herb] 1892-1929 (5, 6, 156, 157, 158)
- Oenothera biennis L. [also reported as: Onagra biennis (L.) Scop.]
- Night-blooming cactus 1898 (71) trade name
- Datura stramonium L. [reported as: Datura tatula L. ]
- Night-blooming catchfly 1913-1937 (1, 5, 97)
- Silene noctiflora L.
- Nightcaps 1923-Present (50, 156)
- Anemone quinquefolia L.
- Night-flowering catchfly [Night-flowered catchfly] 1840-1986 (4, 19, 62, 72, 80, 85, 93, 95, 127, 131, 156)
- Silene noctiflora L.
- Night-flowering silene [Nightflowering silene] 1942-Present (50, 155)
- Silene noctiflora L.
- Night-scented gilliflower 1900-1923 (5, 156, 158)
- Hesperis matronalis L.
- Nightshade [Night-shade]
- 1900 (158) misapplied
- Chenopodium simplex (Torr.) Raf. [reported as: Chenopodium hybridum L. ]
- 1818-Present (1, 4, 10, 50, 92, 109, 138, 148, 155, 156)
- Solanum L. [also reported as: Solanum (Tourn.) L.]
- 1900-1907 (72, 158) IA
- Solanum dulcamara L.
- Nightshade vine 1876-1898 (71, 92)
- Solanum dulcamara L.
- Nightshade with the white flower 1671 (46) accidentally introduced by 1671, Josselyn
- Solanum ptychanthum Dunal [reported as: Solanum nigrum (auct. non L.) ]
- Night-violet [Night violet] 1923 (156)
- Hesperis matronalis L.
- Nikakitspak (Pawnee, forehead-pop) 1919 (37)
- Physalis heterophylla Nees
- Nikiís (Pawnee) 1830 (37)
- Zea mays L.
- Nikso kororik kahtsu nitawau (Pawnee, herb which bears what resembles an ear of corn) 1913 (5)
- Arisaema triphyllum (L.) Schott
[reported as: Arisaema triphyllum (L.) Torr. ]
- Nimble Kate [Nimble-Kate] 1900-1929 (5, 156, 157, 158)
- Sicyos angulatus L.
- Nimbleweed [Nimble-weed]
- 1923 (156)
- Anemone cylindrica Gray
- 1913 (5)
- Anemone quinquefolia L.
- 1923 (156)
- Anemone virginiana L.
- Nimble-will [Nimble will, Nimblewill]
- 1896 (45)
- Muhlenbergia glomerata (Willd.) Trin.
- 1884-1913 (80, 87) IA, Southern states
- Muhlenbergia mexicana (L.) Trin.
- 1837-Present (3, 16, 45, 50, 56, 66, 80, 87, 93, 94, 99, 111, 119, 122, 155, 163)
- Muhlenbergia schreberi J.F. Gmel.[also reported as: Muhlenbergia diffusa Sr.]
- Ninbegoskok (Chippewa) 1932 (105)
- Pyrola elliptica Nutt.
- Nine-anther dalea 1977 (3)
- Dalea enneandra Nutt.
- Nine-anther prairie clover [Nineanther prairie clover] 1986-Present (4, 50)
- Dalea enneandra Nutt.
- Nine-awn pappus grass [Nineawn pappusgrass] Present (50)
- Enneapogon desvauxii Desv. ex Beauv.
- Ninebark [Nine bark, Nine-bark]
- 1911 (59)
- Euonymus atropurpurea Jacq. [reported as: Euonymus atropurpureus Jacq. ]
- 1900-Present (1, 4, 50, 82, 93, 109, 138, 155, 156, 158)
- Physocarpus (Camb.) Raf. [also reported as: Opulaster Medik., Physocarpus Maxim ]
- 1897-1986 (3, 4, 63, 82, 105, 112)
- Physocarpus opulifolius (L.) Maxim.
- 1930 (82) IA
- Physocarpus opulifolius (L.) Maxim. var. intermedius (Rydb.) B.L. Robins.
- Ninebark syringa 1923 (156)
- Physocarpus opulifolius (L.) Maxim. var. intermedius (Rydb.) B.L. Robins.
- Ninety-knot [Ninety knot] 1876-1923? (5, 92, 156, 158)
- Polygonum aviculare L.
- Ningahi h'te (Omaha-Ponca) 1919 (37)
- Cornus sericea L. ssp. sericea [reported as: Cornus stolonifera Michx.]
- Niniba zon (Osage, pipestem wood) 1918?-1970? (121)
- Euonymus atropurpurea Jacq. [reported as: Euonymus atropurpureus Jacq. ]
- Ninigahi (Omaha-Ponca, pipe-mix) 1919 (37)
- Cornus amomum P. Mill.
- Ninsin 1828-1900 (7, 158) misapplied
- Panax quinquefolius L. [also reported as: Panax quinquefolium L. ]
- Ninsin root 1876 (92)
- Panax quinquefolius L. [reported as: Panax quinquefolium L. ]
- Niobe willow 1949 (109)
- Salix ×pendulina Wenderoth [babylonica × fragilis] [reported as: Salix blanda Anderss. ]
- Nipi minan (Cree) 1919 (107)
- Viburnum opulus L.
- Nipinminan (Chippewa) 1932 (105)
- Viburnum opulus L. var. americanum Aiton [reported as: Viburnum americanum L. ]
- Nipple cactus
- 1913?-1937 (5, 93, 97, 156)
- Escobaria missouriensis (Sweet) D.R. Hunt var. missouriensis [also reported as: Coryphantha missouriensis (Sweet) Britton & Rose, Mammillaria missouriensis Sweet, Neobessya missouriensis (Nutt.) Britton & Rose ]
- 1932-1986 (1, 4)
- Mammillaria Haw. [also reported as: Neomammillaria Britton & Rose ]
- 1986 (4)
- Pediocactus Britton & Rose
- Nipple thistle 1882 (14)
- Mammillaria Haw.
- Nippleweed [Nipple weed, Nipple-weed]
- 1936 (93) Neb
- Thelesperma filifolium (Hook.) Gray var. filifolium [reported as: Thelesperma trifidum (Poir.) Britton ]
- 1926 (98) Neb
- Thelesperma megapotamicum (Spreng.) Kuntze
- Nipplewort
- 1923-Present (50, 156)
- Lapsana L.
- 1876-1986 (4, 5, 92, 107, 156)
- Lapsana communis L.
- Nisude-hi (Omaha-Ponca, flute-plant} 1919 (37)
- Thalictrum dasycarpum Fisch. & Avé-Lall.
- Nitiminš (Chippewa, spear timber) 1932 (105)
- Fraxinus americana L.
- Nits-and-lice 1977-Present (3, 4, 50)
- Hypericum drummondii (Grev. & Hook.) Torr. & Gray
- Niwaharit (Pawnee) 1919 (37) niwaharit-nahaapi (Plum tree) 37
- Prunus angustifolia Marsh.
- Niya'wibûkûk (Chippewa) 1928 (40)
- Eupatorium perfoliatum L.
- Noa (Missouri tribes) 1828 (7)
- Apios americana Medik. [reported as: Apios tuberosa Moench ]
- Noah's ark 1828-1923 (5, 7, 156)
- Cypripedium parviflorum Salisb.
[also reported as: Cypripedium luteum Raf.]
- Noble goldenrod [Noble golden-rod] 1913-1942 (5, 155, 156)
- Solidago speciosa Nutt
- Nodding beardtongue Present (50)
- Penstemon laxiflorus Pennell
- Nodding beggarticks [Nodding beggar-ticks] 1926-Present (3, 4, 50, 98, 155) Neb
- Bidens cernua L.
- Nodding brome 1942-1977 (3, 155)
- Bromus porteri (Coult.) Nash [reported as: Bromus anomalus ]
- Nodding buckwheat
- Present (50)
- Eriogonum cernuum Nutt.
- Present (50)
- Eriogonum cernuum Nutt. var. cernuum
- Nodding bulbous saxifrage 1913 (5)
- Saxifraga cernua L.
- Nodding bur-marigold [Nodding burr marigold] 1899-1937 (5, 72, 93, 97, 131, 156, 158)
- Bidens cernua L.
- Nodding chickweed 1907-Present (4, 5, 50, 72, 80, 93, 97, 156)
- Cerastium nutans Raf. [also reported as: Cerastium longipedunculatum Muhl.]
- Nodding eriogonum 1913-1942 (5, 93, 155)
- Eriogonum cernuum Nutt.
- Nodding fescue or Nodding fescue grass [Nodding fescue-grass]
- 1852-1913 (5, 56, 66, 72, 163)
- Festuca paradoxa Desv. [also reported as: Festuca nutans Willd. ]
- 1852-Present (3, 50, 122, 155, 163)
- Festuca subverticillata (Pers.) Alexeev [also reported as: Festuca obtusa Biehler]
- Nodding garlic 1923 (156)
- Allium cernuum Roth
- Nodding green violet 1986 (4)
- Hybanthus verticillatus (Ort.) Baill.
- Nodding ladies'-tresses [Nodding ladies' tresses, Nodding ladiestresses] 1840-Present (5, 19, 50, 72, 93, 97, 109, 122, 138, 156)
- Spiranthes cernua (L.) L.C. Rich. [also reported as: Gyrostachys cernua (L.) Kuntze,Ibidium cernuum (L.) House., Neottia cernua (L.) Sw.]
- Nodding lily [Nodding lilies]
- 1840-1894 (5, 19, 75, 92, 156, 157, 158)
- Lilium canadense L.
- 1892-1894 (5, 73, 75, 158)
- Lilium superbum L.
- Nodding muhly 1942-Present (50, 155)
- Muhlenbergia bushii Pohl [also reported as: Muhlenbergia brachyphylla Bush ]
- Nodding onion
- 1923-Present (50, 138, 155)
- Allium cernuum Roth
- Present (50)
- Allium cernuum Roth var. cernuum
- Nodding plumeless thistle Present (50)
- Carduus nutans L.
- Nodding pogonia 1907-1977 (3, 72, 156)
- Triphora trianthophora (Sw.) Rydb. [also reported as: Pogonia trianthophora ]
- Nodding saxifrage 1899-Present (4, 50, 131)
- Saxifraga cernua L.
- Nodding smartweed 1913-1930 (80, 82) IA
- Polygonum lapathifolium L.
- Nodding spurge 1923 (156)
- Chamaesyce nutans (Lag.) Small [reported as: Euphorbia preslii Guss. ]
- Nodding stickseed
- Present (50)
- Hackelia deflexa (Wahlenb.) Opiz
- 1899-1936 (5, 72, 93, 131)
- Hackelia deflexa (Wahlenb.) Opiz var. americana (Gray) Fern. & I.M. Johnston [also reported as: Lappula americana (Gray) Rydb., Lappula deflexa (Wahlenb.) Garcke p.p. ]
- Nodding sticktight 1930 (82) IA
- Bidens cernua L.
- Nodding thistle 1986 (4)
- Carduus nutans L.
- Nodding tiger lily [Nodding tiger-lily] 1923 (156) misapplied
- Lilium superbum L.
- Nodding trillium 1923-1977 (3, 138, 155, 156)
- Trillium cernuum L.
- Nodding vanilla grass 1913 (5)
- Hierochloe odorata (L.) Beauv. [reported as: Savastana nashii Bicknell]
- Nodding violet 1900-1937 (5, 65, 97, 158)
- Hybanthus verticillatus (Ort.) Baill. [also reported as: Calceolaria verticillata (Ort.) Kuntze ]
- Nodding wake-robin [Nodding wake robin, Nodding wakerobin]
- 1907-1933 (5, 72, 127, 156, 158)
- Trillium cernuum L.
- Present (50)
- Trillium flexipes Raf.
- Nodding water-nymph [Nodding waternymph] Present (50)
- Najas flexilis (Willd.) Rostk. & Schmidt
- Nodding white trillium 1895 (2)
- Trillium cernuum L.
- Nodding wild buckwheat 1986 (4)
- Eriogonum cernuum Nutt.
- Nodding wild onion 1907-1936 (5, 72, 93, 156)
- Allium cernuum Roth
- Nodding wild rye [Nodding wild-rye, Nodding wildrye] 1852-1958 (5, 72, 85, 87, 93, 116, 119, 140, 143, 163)
- Elymus canadensis L.
- Nodding-caps [Noddingcaps,Nodding cap] 1932-Present (1, 50)
- Triphora Nutt.
- Nogal 1904 (149) NM
- Juglans microcarpa Berl. var. microcarpa [reported as: Juglans rupestris Engelm. ]
- Noisetier (French) 1785 (8)
- Corylus L.
- Noisetier à fruit cornu (French) 1785 (8)
- Corylus cornuta Marsh [reported as: Corylus cornuta H.R.P. ]
- Noisetier d'Amérique (French) 1785 (8)
- Corylus americana Walt.
- Noix 1879 (46)
- Juglans cinerea L.
- Nokwe'jigûn (Chippewa, something soft) 1928 (40)
- Artemisia ludoviciana Nutt. ssp. ludoviciana [reported as: Artemisia gnaphalodes Nutt. ]
- None-so-pretty [None so pretty]
- 1828-1923 (5, 7, 92, 156, 158) misapplied
- Anaphalis margaritacea (L.) Benth. & Hook
[also reported as: Gnaphalium margaritaceum]
- 1892 (6)
- Pseudognaphalium obtusifolium (L.) Hilliard & Burtt ssp. obtusifolium [reported as: Gnaphalium polycephalum Michx., Gnaphalium obtusifolium L.]
- 1896-1900 (76, 158) Abington MA
- Viola tricolor L.
- Nonesuch [None-such, Nonsuch]
- 1900-1923? (5, 156, 158) obsolete by 1923
- Lychnis chalcedonica L.
- 1932 (1)
- Medicago L. [reported as: Medicago (Tourn.) L. ]
- 1840-1923 (5, 19, 45, 46, 62, 92, 107, 156, 158)
- Medicago lupulina L.
- Nonpa tanga (Omaha-Ponca, big cherry) 1919 (37)
- Prunus pumila L. var. besseyi (Bailey) Gleason [reported as: Prunus besseyi Bailey ]
- Nonpa-zhinga (Omaha-Ponca, little cherry) 1919 (37)
- Prunus virginiana L. var. virginiana
[reported as: Padus nana (Du Roi) M. Roemer ]
- Nonsi (Omaha-Ponca) 1919 (37) Nonsi-hi (Hickory tree)
- Carya ovata (P. Mill.) K. Koch [reported as: Hicoria ovata (P. Mill.) Britton ]
- Noo (Omaha) 1820 (38)
- Pediomelum esculentum (Pursh) Rydb. [reported as: Psoralea esculenta Pursh ]
- Noon-day flower [Noon day flower, Noon-day-flower] 1876-1900 (92, 158)
- Tragopogon pratensis L.
- Noonflower [Noon flower, Noon-flower] 1876-1923 (5, 92, 156, 158)
- Tragopogon pratensis L.
- Noontide [Noon tide, Noon-tide] 1876-1923 (5, 92, 156, 158)
- Tragopogon pratensis L.
- Nopal [Nopales] 1896-1904 (149, 151)
- Opuntia P. Mill.
- Nopal cactus [Nopalcactus] 1942 (155)
- Opuntia P. Mill. [reported as: Nopalea Salm-Dyck]
- Nordamerikanisches Frauenhaar (German) 1900 (158)
- Adiantum pedatum L.
- Normandy cress 1929 (157)
- Barbarea vulgaris Aiton f. [reported as: Barbarea barbarea (L.) MacM. ]
- Norrislegrass (Norway) 1879 (46)
- Linnaea borealis L.
- North American bow-wood 1900 (158)
- Maclura pomifera (Raf.) Schneid. [reported as: Toxylon pomiferum Raf. ]
- North American calceolaria [NorthAmerican calceolaria] 1942-1977 (3, 155)
- Hybanthus verticillatus (Ort.) Baill. [also reported as: Calceolaria verticillata (Ort.) Kuntze ]
- North American ebony 1900-1923 (156, 158)
- Diospyros virginiana L.
- North American locust tree 1900-1929 (157, 158)
- Robinia pseudoacacia L. [also reported as: Robinia pseudo-acacia L. ]
- North American papaw 1900-1937 (5, 97, 156, 158)
- Asimina triloba (L.) Dunal [also reported as: Asimina triloba Dunal.]
- North Eastern redcedar 1942 (155)
- Juniperus virginiana L. var. virginiana [reported as: Juniperus virginiana L. var. crebra Fern. & Grisc. ]
- Northern adder's-tongue [Northern adderstongue] Present (50)
- Ophioglossum pusillum Raf.
- Northern bedstraw 1899-Present (3, 4, 5, 50, 63, 72, 82, 85, 93, 109, 122, 127, 131, 138, 155, 156)
- Galium boreale L.
- Northern blue violet 1913-1949 (5, 109, 138)
- Viola sororia Willd. [also reported as: Viola septentrionalis Greene ]
- Northern blue-eyed grass [Northern blue eyed grass] 1907 (72) IA
- Sisyrinchium angustifolium Mill.
- Northern bog aster Present (50)
- Symphyotrichum boreale (Torr. & Gray) A.& D. Löve
- Northern bog bedstraw Present (50)
- Galium labradoricum Wiegand
- Northern bog violet 1913-Present (4, 5, 50)
- Viola nephrophylla Greene
- Northern bugleweed [Northern bugle weed] 1913-Present (5, 50, 93)
- Lycopus uniflorus Michx.
- Northern buttercup 1913-1937 (127, 80, 97)
- Ranunculus hispidus Michx.var. nitidus (Chapman) T. Duncan [also reported as: Ranunculus septentrionalis Poir. ]
- Northern catalpa 1942-Present (4, 50, 155)
- Catalpa speciosa (Warder) Warder ex Engelm.
- Northern cherry 1857 (20)
- Prunus pensylvanica L. f. var. pensylvanica [reported as: Cerasus pennsylvanica Torr. & Gray, Cerasus pensylvanica]
- Northern cleomella 1913-1937 (5, 97) OK
- Cleomella angustifolia Torr.
- Northern cottonwood
- 1949 (109)
- Populus deltoides Bartr. ex Marsh.
- 1923 (138)
- Populus deltoides Bartr. ex Marsh. ssp. monilifera (Aiton) Eckenwalder [reported as: Populus monilifera Aiton ]
- Northern dewberry 1910-Present (4, 50, 135, 138, 155)
- Rubus flagellaris Willd. [also reported as: Rubus nigrobaccus Bailey, Rubus villosus Aiton ]
- Northern dropseed [Northern drop-seed] 1913-1958 (5, 93, 115, 116, 119, 134)
- Sporobolus heterolepis (Gray) Gray
- Northern evening-primrose [Northern evening primrose] 1913?-1923 (5, 138)
- Oenothera biennis L. [also reported as: Oenothera muricata L. ]
- Northern fogfruit [Northern fog-fruit] 1986 (4)
- Phyla lanceolata (Michx.) Greene [reported as: Lippia lanceolata Michx. ]
- Northern fox sedge Present (50)
- Carex vulpinoidea Michx.var. vulpinoidea
- Northern gentian
- 1977-1986 (3, 4)
- Gentiana affinis Griesb.
- 1899-1942 (5, 131, 155, 156)
- Gentianella amarella (L.) Boerner ssp. acuta (Michx.) J. Gillett [also reported as: Gentiana acuta Michx., Gentiana amarella L. var. acuta ]
- Northern gooseberry
- 1907 (72) IA
- Ribes oxyacanthoides L.
- 1913-1932 (5, 85)
- Ribes oxyacanthoides L. ssp. oxyacanthoides [also reported as: Grossularia oxyacanthioides (L.) P. Mill. ]
- Northern grass-of-Parnassus 1913-1986 (3, 4, 5)
- Parnassia palustris L.
- Northern green orchid
- Present (50)
- Platanthera hyperborea (L.) Lindl.
- 1913-Present (3, 5, 50, 138)
- Platanthera hyperborea (L.) Lindl. var. hyperborea [also reported as: Habenaria hyperborea (L.) R. Br., Limnorchis hyperborea (L.) Rydb. ]
- Northern green rush
- Present (50)
- Juncus alpinoarticulatus Chaix
- Present (50)
- Juncus alpinoarticulatus Chaix ssp. nodulosus (Wahlenb.) Hämet-Ahti
- Northern hackberry 1930 (106)
- Celtis occidentalis L.
- Northern hawthorn 1986 (4)
- Crataegus chrysocarpa Ashe [reported as: Crataegus rotundifolia Moench ]
- Northern hickory 1913 (5)
- Carya ovata (P. Mill.) K. Koch [reported as: Hicoria borealis Ashe ]
- Northern holly fern [Northern hollyfern] Present (50)
- Polystichum lonchitis (L.) Roth.
- Northern holy grass 1896 (45)
- Hierochloe odorata (L.) Beauv. [reported as: Savastana odorata (L.) Scribn. ]
- Northern Idaho biscuitroot Present (50)
- Lomatium orientale Coult & Rose
- Northern june-berry 1936 (93) Neb
- Amelanchier humilis Wiegand
- Northern limnanthus Present (50)
- Linanthus septentrionalis Mason
- Northern maidenhair Present (50)
- Adiantum pedatum L.
- Northern manna grass [Northern manna-grass, Northern mannagrass] 1913-1977 (3, 5, 94, 155)
- Glyceria borealis (Nash) Batchelder [also reported as: Panicularia borealis Nash]
- Northern marsh violet 1986 (4)
- Viola palustris L.
- Northern marsh yellow-cress [Northern marsh yellowcress] Present (50)
- Rorippa islandica (Oed.) Borbas
- Northern meadow barley 1977 (3)
- Hordeum brachyantherum Nevski
- Northern meadow sedge 1913 (5)
- Carex praticola Rydb.
- Northern mint 1840 (19)
- Mentha arvensis L.
- Northern nemastylis 1913-1937 (5, 97)
- Nemastylis geminiflora Nutt. [also reported as: Nemastylis acuta (Bart.) Herb.]
- Northern nut-grass [Northern nut grass] 1913-1937 (80, 122)
- Cyperus esculentus L.
- Northern pin oak 1923-Present (4, 50, 82, 138, 155)
- Quercus ellipsoidalis E.J. Hill
- Northern pondweed 1899-1932 (5, 85, 131)
- Potamogeton alpinus Balbis
- Northern poplar 1942 (155)
- Populus deltoides Bartr. ex Marsh. ssp. deltoides [reported as: Populus deltoides Bartr. ex Marsh. var. virginiana (Foug.) Sudworth ]
- Northern prickly ash 1892-1930 (2, 6, 49, 53, 55, 57, 82, 156, 157)
- Zanthoxylum americanum P. Mill. [also reported as: Xanthoxylum americanum P. Mill.]
- Northern pussy-toes 1986 (4)
- Antennaria howellii Greene ssp. neodioica (Greene) Bayer [reported as: Antennaria neodioica Greene ]
- Northern red oak
- Present (50)
- Quercus rubra L.
- 1923-Present (50, 138, 155)
- Quercus rubra L. var. ambigua (Gray) Fern. [also reported as: Quercus borealis Michx.f., Quercus rubra ambigua ]
- 1936-Present (50, 93)
- Quercus rubra L. var. rubra [also reported as: Quercus borealis maxima ]
- Northern red-top
- 1884-1913 (5, 87)
- Agrostis exarata Trin. [also reported as: Agrostis asperifolia Trin. ]
- 1913 (5)
- Agrostis perennans (Walt.) Tuckerman
- Northern reed grass [Northern reed-grass, Northern reedgrass] 1913-Present (3, 5, 50, 93, 116, 155)
- Calamagrostis stricta (Timm) Koel. ssp. inexpansa (Gray) C.W. Greene [also reported as: Calamagrostis hyperborea Lange, Calamagrostis hyperborea Lange var. americana (Vasey) Kearney, Calamagrostis inexpansa Gray ]
- Northern rockcress [Northern rock cress] 1986 (4)
- Barbarea orthoceras Ledeb.
- Northern rock-jasmine [Northern rock jasmine] 1986 (4)
- Androsace septentrionalis L.
- Northern scouring-rush [Northern scouring rush] 1929 (157)
- Equisetum variegatum Schleich. ex F. Weber & D.M.H. Mohr
- Northern scrub pine 1857-1932 (1, 20, 136)
- Pinus banksiana Lamb.
- Northern selaginella Present (50)
- Selaginella rupestris (L.) Spring
- Northern senega 1911 (55)
- Polygala senega L. [reported as: Polygala senega L. var. latifolia Torr. & Gray ]
- Northern shorthusk Present (50)
- Brachyelytrum septentrionale (Babel) G. Tucker
- Northern single-spike sedge [Northern singlespike sedge] Present (50)
- Carex scirpoidea Michx.
- Northern slender ladies' tresses [Northern slender ladies'-tresses]
- Present (50)
- Spiranthes lacera (Raf.) Raf.
- Present (50)
- Spiranthes lacera (Raf.) Raf. var. gracilis (Bigelow) Luer
- Present (50)
- Spiranthes lacera (Raf.) Raf. var. lacera
- Northern sneezeweed 1930 (106)
- Helenium autumnale L.
- Northern spear grass [Northern spear-grass]
- 1901 (94)
- Poa nemoralis L.
- 1913 (5)
- Poa palustris L. [reported as: Poa crocata Michx. ]
- Northern spicebush Present (50)
- Lindera benzoin Blume.
- Northern spleanwort 1899 (131) SD
- Asplenium septentrionale (L.) Huds.
- Northern starwort 1942-Present (50, 155)
- Stellaria calycantha (Ledeb.) Bong. [also reported as: Stellaria borealis]
- Northern stitchwort 1986 (4)
- Stellaria calycantha (Ledeb.) Bong.
- Northern sweet grass [Northern sweetgrass]
- Present (50)
- Hierochloe hirta (Schrank) Borbás
- Present (50)
- Hierochloe hirta (Schrank) Borbás ssp. arctica (J. Presl) G. Weim.
- Northern sweetvetch 1942 (155)
- Hedysarum boreale Nutt.
- Northern valerian 1913 (5)
- Valeriana dioica L. [reported as: Valeriana septentrionalis Rydb. ]
- Northern vine 1892 (6)
- Humulus lupulus L.
- Northern watermeal Present (50)
- Wolffia borealis (Engelm. ex Hegelm.) Landolt ex Landolt & Wildi
- Northern water-plantain [Northern water plantain] Present (50)
- Alisma triviale Pursh
- Northern water-starwort Present (50)
- Callitriche hermaphroditica L.
- Northern wheatgrass [Northern wheat grass] 1913-Present (5, 50, 85)
- Elymus lanceolatus (Scribn. & J.G. Sm.) Gould
[also reported as: Agropyron dasystachyum (Hook.) Scribn. ]
- Northern white violet 1913 (5)
- Viola macloskeyi Lloyd [reported as: Viola pallens (Banks.) Brainerd ]
- Northern wild comfrey 1913-1986 (3, 4, 5)
- Cynoglossum virginianum L. var. boreale (Fern.) Cooperrider [also reported as: Cynoglossum boreale Fern. ]
- Northern wild rice [Northern wildrice]
- 1923 (138)
- Zizania aquatica L.
- Present (50)
- Zizania palustris L.
- Present (50)
- Zizania palustris L. var. interior (Fassett) Dore
- 1942-Present (50, 155)
- Zizania palustris L. var. palustris
[also reported as: Zizania aquatica L. var. angustifolia A.S. Hitchc. ]
- Northern willow herb [Northern willow-herb, Northern willowherb,] 1899-1936 (5, 72, 93, 131)
- Epilobium ciliatum Raf. ssp. ciliatum [also reported as: Epilobium adenocaulon Haussk. ]
- Northern yellow honeysuckle 1900 (158)
- Lonicera dioica L.
- Northwest Territory sedge Present (50)
- Carex utriculata Boott
- Northwestern juneberry [Northwestern June berry, Northwestern-juneberry, Northwestern June-berry] 1899-1929 (5, 72, 131, 157, 158) IA SD
- Amelanchier alnifolia (Nutt.) Nutt. ex M. Roemer
- Northwestern serviceberry [Northwestern Service berry] 1900-1929 (5, 157, 158)
- Amelanchier alnifolia (Nutt.) Nutt. ex M. Roemer
- Norton's flax 1986 (4)
- Linum pratense (Nort.) Small
- Norwegian cinquefoil [Norway cinquefoil]
- 1895-Present (2, 4, 50, 155)
- Potentilla norvegica L.
- 1923-Present (50, 156)
- Potentilla norvegica L. ssp. monspeliensis (L.) Aschers. & Graebn. [also reported as: Potentilla monspeliensis L. ]
- Nosebleed [Nose bleed, Nose-bleed]
- 1892-1929 (6, 69, 92, 107, 148, 156, 157, 158)
- Achillea millefolium L.
- 1894-1923? (5, 75, 156) CT, obsolete by 1923
- Castilleja coccinea (L.) Spreng.
- 1923 (156)
- Trillium sessile L.
- Nosebleed sanguinary [Nosebleed-sanguinary] 1923 (156)
- Achillea millefolium L.
- Noseburn
- 1942-Present (4, 50, 155)
- Tragia L.
- 1986 (4)
- Tragia betonicifolia Nutt.
- 1986 (4)
- Tragia ramosa Torr.
- Notch-bract waterleaf [Notchbract waterleaf] 1977-1986 (3, 4)
- Hydrophyllum appendiculatum Michx.
- Notched milkvetch [Notched milk vetch] 1899 (131) SD
- Astragalus gracilis Nutt. [reported as: Astragalus microlobus Gray ]
- Notched purslane 1907-1923 (5, 72, 156) IA
- Portulaca oleracea L. [also reported as: Portulaca retusa Engelm. ]
- Notch-petalled claytonia 1878 (86)
- Claytonia virginica L.
- Notch-seed buckwheat [Notch-seeded buckwheat] 1886-1919 (107, 110)
- Fagopyrum esculentum Moench [also reported as: Polygonum emarginatum Roth ]
- Notholaena 1900 (158)
- Notholaena R. Br.
- November goldenrod 1923-1942 (138, 155)
- Solidago gigantea Aiton [also reported as: Solidago gigantea Aiton var. leiophylla Fern., Solidago serotina Aiton ]
- Noyer (French) 1785 (8)
- Juglans L.
- Noyer à fruit blanc ovale (French) 1785 (8)
- Carya cordiformis (Wangenh.) K. Koch [reported as: Juglans alba ovata ]
- Noyer à fruit noir (French) 1785 (8)
- Juglans nigra L.
- Noyer Gris (French) 1892 (6)
- Juglans cinerea L.
- Noyer pacanier (French) 1785 (8)
- Carya illinoinensis (Wangenh.) K. Koch [reported as: Juglans pecan]
- Noyers 1879 (46)
- Juglans cinerea L.
- Nu (Omaha-Ponca) 1919 (37)
- Apios americana Medik. [reported as: Glycine apios L. ]
- Nucipersica 1587 (110)
- Prunus persica (L.) Batsch [reported as: Amygdalus persica L. ]
- Nugthe (Omaha-Ponca) 1919 (37)
- Pediomelum esculentum (Pursh) Rydb. [reported as: Psoralea esculenta Pursh ]
- Nummularia norwegica repens folio dentato floribus geminus 1879? (46) Petiver
- Linnaea borealis L.
- Nuppikt (Pawnee, sour top) 1919 (37)
- Rhus glabra L.
- Nu-sû'-pi (Choctaw) 1855 (132)
- Quercus L.
- Nut grass 1932 (1)
- Cyperus L. [reported as: Cyperus L. ]
- Nut pine [Nut-pine]
- 1894-1923 (75, 107, 138)
- Pinus edulis Engelm.
- 1949 (109)
- Pinus flexilis James [reported as: Pinus cembroides Zucc. var. edulis (Engelm.) Voss ]
- Nut pine of New Mexico 1856-1894 (75, 147)
- Pinus edulis Engelm.
- Nut-grass [Nut grass, Nutgrass]
- 1932 (1)
- Cyperus L. [reported as: Cyperus L. ]
- 1932 (85) SD
- Cyperus bipartitus Torr. [reported as: Cyperus rivularis Kunth ]
- 1897-1912 (145, 152, 157, 158)
- Cyperus esculentus L.
- 1895-Present (3, 2, 5, 50, 66, 92, 156)
- Cyperus rotundus L. [also reported as: Cyperus hydra]
- 1894-1923 (75, 156) Concord MA tubers are eaten by children
- Cyperus strigosus L.
- Nut-grass flatsedge [Nutgrass flatsedge] 1942 (155)
- Cyperus rotundus L.
- Nut-rush [Nutrush, Nut rush] 1932-Present (1, 50)
- Scleria Berg.
- Nuttall's alkali grass [Nuttall's alkaligrass, Nuttall alkali grass, Nuttall alkaligrass] 1939-Present (50, 146, 155)
- Puccinellia nuttalliana (J.A. Schultes) A.S. Hitchc.
- Nuttall's atriplex 1913-1936 (5, 93)
- Atriplex nuttallii S. Wats.
- Nuttall's biscuitroot Present (50)
- Lomatium nuttallii (Gray) J.F. Macbr.
- Nuttall's bladderpod Present (50)
- Lesquerella gracilis (Hook.) S. Wats. ssp. nuttallii (T.& G.) Rollins & Shaw
- Nuttall's bur-reed 1913-1938 (5, 120)
- Sparganium americanum Nutt.
- Nuttall's camas [Nuttall's camass] 1913-1937 (5, 93, 97)
- Zigadenus nuttallii (Gray) S. Wats. [also reported as: Toxicoscordion nuttallii (A. Gray) Rydb. ]
- Nuttall's cinquefoil [Nuttall cinquefoil] 1942 (155)
- Potentilla gracilis Dougl. [reported as: Potentilla nuttallii Lehm. ]
- Nuttall's death-camas [Nuttall's deathcamas, Nuttall deathcamas] 1942-Present (50, 155)
- Zigadenus nuttallii (Gray) S. Wats.
- Nuttall's dog-parsley [Nuttall dogparsley] 1913-1942 (5, 155)
- Lomatium nuttallii (Gray) J.F. Macbr. [also reported as: Cynomarathrum nuttallii (Gray) Coult. & Rose ]
- Nuttall's evening-primrose [Nuttall's evening primrose] 1913-Present (5, 50)
- Oenothera nuttallii Sweet [also reported as: Anogra nuttallii (Sweet) Spach. ]
- Nuttall's evolvulus [Nuttall evolvulus] 1942-1986 (3, 4, 155)
- Evolvulus nuttallianus J.A. Schultes [also reported as: Evolvulus nuttallianus R. & S. ]
- Nuttall's golden aster 1913-1937 (5, 97)
- Chrysopsis pilosa Nutt.
- Nuttall's goldenweed [Nuttall goldenweed] 1942 (155)
- Machaeranthera grindelioides (Nutt.) Shinners var. grindelioides [reported as: Aplopappus nuttalli ]
- Nuttall's kentrophyta 1986 (4)
- Astragalus kentrophyta Gray
- Nuttall's larkspur [Nuttall larkspur] 1942 (155)
- Delphinium nuttallianum Pritz ex. Walp.
- Nuttall's little rose Present (50)
- Chamaerhodos erecta (L.) Bunge ssp. nuttallii (Pickering ex Rydb.) Hultén
- Nuttall's Mariposa lily 1913-1936 (5, 93)
- Calochortus nuttallii Torr. & Gray
- Nuttall's mock bishop's-weed [Nuttall's mock bishop's weed, Nuttall's mock bishop-weed] 1913-1937 (5, 97)
- Ptilimnium nuttallii (DC.) Britton
- Nuttall's monolepis [Nuttall monolepis] 1942 (155)
- Monolepis nuttalliana (J.A. Schultes) Greene
- Nuttall's onion [Nuttall onion] 1942 (155)
- Allium drummondii Regel [reported as: Allium nuttallii S. Wats. ]
- Nuttall's oxytrope Present (50)
- Oxytropis multiceps Nutt.
- Nuttall's pasqueflower [Nuttall's pasque flower, Nuttall's pasque-flower] 1878-1929 (86, 157, 158)
- Pulsatilla patens (L.) P. Mill. ssp. multifida (Pritz.) Zamels [also reported as: Anemone patens L. var. nuttalliana (DC.) Gray ]
- Nuttall's pondweed 1907-1913 (5, 72)
- Potamogeton epihydrus Raf. [also reported as: Potamogeton nuttallii Cham & Sch. ]
- Nuttall's poverty-weed [Nuttall's povertyweed] Present (50)
- Monolepis nuttalliana (J.A. Schultes) Greene
- Nuttall's prairie parsley 1913-Present (5, 50, 97)
- Polytaenia nuttallii DC. [also reported as: Pleiotaenia nuttallii (DC.) Coult. & Rose ]
- Nuttall's saltbush Present (50)
- Atriplex nuttallii S. Wats.
- Nuttall's saltsage [Nuttall's salt-sage] 1899 (141) WY
- Atriplex nuttallii S. Wats.
- Nuttall's sensitive brier [Nuttall's sensitive-briar] Present (50)
- Mimosa nuttallii (DC.) B.L. Turner
- Nuttall's stonecrop [Nuttall stonecrop] 1913-1942 (5, 97, 155)
- Sedum nuttallianum Raf.
- Nuttall's sunflower
- 1986-Present (4, 50)
- Helianthus nuttallii Torr. & Gray
- 1977-Present (3, 50)
- Helianthus nuttallii Torr. & Gray ssp. nuttallii
- Nuttall's violet [Nuttall violet] 1899 (4, 5, 50, 93, 127, 131, 155)
- Viola nuttallii Pursh
- Nuttall's waterweed [Nuttall's water-weed] 1913 (5)
- Elodea nuttallii (Planch.) St. John [reported as: Philotria nuttallii (Planch.) Rydb. ]
- Nuttall's weed [Nuttall-weed] 1876-1923? (5, 92, 156, 158) obsolete by 1923
- Coreopsis tinctoria Nutt.
- Nuttall's wild onion 1913-1937 (5, 93, 97)
- Allium drummondii Regel [also reported as: Allium nuttallii S. Wats. ]
- Nyctelea 1913-1937 (5, 93, 97)
- Ellisia nyctelea (L.) L. [also reported as: Nyctelea nyctelea (L.) Britton ]
- Nylon hedgehog cactus
- Present (50)
- Echinocereus viridiflorus Engelm.
- Present (50)
- Echinocereus viridiflorus Engelm. var. viridiflorus
- Nymphaea 1949 (109)
- Nymphaea L.
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