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- Nabalus albus (L.) Hook., See Prenanthes alba L.
- Nabalus asperus (Michx.) Torr. & Gray, See Prenanthes aspera Michx.
- Nabalus racemosus (Michx.) DC., See Prenanthes racemosa Michx. ssp. multiflora Cronq.
- Nabalus Cass., See Prenanthes L.
- Naias guadalupenis (Spreng.) Morong , See Najas guadalupensis (Spreng.) Magnus
- Naias marina L., See Najas marina L.
- Naias L. , See Najas L.
- Najas caespitosa (Maguire) Reveal, See Najas flexilis (Willd.) Rostk. & Schmidt
- Najas canadensis Michx., See Najas flexilis (Willd.) Rostk. & Schmidt
- Najas flexilis (Willd.) Rostk. & Schmidt
- Najas flexilis (Willd.) Rostk. & Schmidt ssp. caespitosa Maguire, See Najas flexilis (Willd.) Rostk. & Schmidt
- Najas flexilis (Willd.) Rostk. & Schmidt var. congesta Farw., See Najas flexilis (Willd.) Rostk. & Schmidt
- Najas flexilis (Willd.) Rostk. & Schmidt var. robusta Morong, See Najas flexilis (Willd.) Rostk. & Schmidt
- Najas gracilis (Morong) Small, See Najas marina L.
- Najas guadalupenis (Spreng.) Morong, See Najas guadalupensis (Spreng.) Magnus
- Najas guadalupensis (Spreng.) Magnus
- Najas major All., See Najas marina L.
- Najas major All. var. angustifolia A. Braun ex K. Schum., See Najas marina L.
- Najas marina L.
- Najas marina L. var. recurvata Dudley, See Najas marina L.
- Najas L.
- Nama foliosum (Woot. & Standl.) Tidestrom, See Nama hispidum Gray
- Nama hispida Gray, See Nama hispidum Gray
- Nama hispidum Gray
- Nama hispidum Gray var. mentzelii Brand, See Nama hispidum Gray
- Nama hispidum Gray var. revolutum Jepson, See Nama hispidum Gray
- Nama hispidum Gray var. spathulatum (Torr.) C.L. Hitchc., See Nama hispidum Gray
- Nama stevensii A.S. Hitchc.
- Nama tenue (Woot. & Standl.) Tidestrom, See Nama hispidum Gray
- Nama L.
- Nardosmia arctica (Porsild) A.& D. Löve, See Petasites frigidus (L.) Fries var. palmatu (Aiton) Cronq.
- Nassella viridula (Trin.) Barkworth
- Nassella (Trin.) Desv.
- Nasturtium austriacum Crantz, See Rorippa austriaca (Crantz) Bess.
- Nasturtium calycinum Engelm., See Rorippa calycina (Engelm.) Rydb.
- Nasturtium hispidum DC, See Rorippa palustris (L.) Bess. ssp. hispida (Desv.) Jonsell
- Nasturtium microphyllum Boenn. ex Reichenb., See Rorippa microphylla (Boenn. ex Reichenb.) Hyl. ex A.& D. Löve
- Nasturtium nasturtium-aquaticum (L.) Karsten, See Rorippa nasturtium-aquaticum (L.) Hayek
- Nasturtium officinale Aiton f., See Rorippa nasturtium-aquaticum (L.) Hayek
- Nasturtium officinale Aiton f. var. siifolium (Reichenb.) W.D.J. Koch, See Rorippa nasturtium-aquaticum (L.) Hayek
- Nasturtium officinale R.Br., See Rorippa nasturtium-aquaticum (L.) Hayek
- Nasturtium officinaleAiton f. var. microphyllum (Boenn. ex Reichenb.) Thellung, See Rorippa microphylla (Boenn. ex Reichenb.) Hyl. ex A.& D. Löve
- Nasturtium palustre DC, See Rorippa palustris (L.) Bess
- Nasturtium palustris DC., See Rorippa palustris (L.) Bess
- Nasturtium sessiliflorum Nutt., See Rorippa sessiliflora (Nutt.) A.S. Hitchc.
- Nasturtium sinuatum Nutt., See Rorippa sinuata (Nutt.) A.S. Hitchc.
- Nasturtium sylvestre R. Br., See Rorippa sylvestris (L.) Bess.
- Nasturtium R. Br. , See Rorippa Scop.
- Naumbergia Moench, See Lysimachia L.
- Naumburgia thyrsiflora (L.) Duby, See Lysimachia thyrsiflora L.
- Navarretia intertexta (Benth.) Hook. ssp. propinqua (Suksdorf) Day
- Navarretia intertexta (Benth.) Hook. var. propinqua (Suksdorf) Brand, See Navarretia intertexta (Benth.) Hook. ssp. propinqua (Suksdorf) Day
- Navarretia propinqua Suksdorf, See Navarretia intertexta (Benth.) Hook. ssp. propinqua (Suksdorf) Day
- Navarretia Ruiz & Pavón
- Neeragrostis reptans (Michx.) Nicora
- Neeragrostis Bush
- Neltuma glandulosa (Torr.) & Rose, See Prosopis glandulosa Torr.
- Nelumbium Willd , See Nelumbo Adans.
- Nelumbium codophyllum Raf., See Nelumbo lutea Willd.
- Nelumbium luteum Juss. , See Nelumbo lutea Willd.
- Nelumbium luteum Willd., See Nelumbo lutea Willd.
- Nelumbium Juss., See Nelumbo Adans.
- Nelumbo lutea (Willd.) Pers., See Nelumbo lutea Willd.
- Nelumbo lutea Pers., See Nelumbo lutea Willd.
- Nelumbo lutea Willd.
- Nelumbo pentapetala Fern., See Nelumbo lutea Willd.
- Nelumbo pentapetala sensu Fern., See Nelumbo lutea Willd.
- Nelumbo (Tourn.) Adans, See Nelumbo Adans.
- Nelumbo Adans.
- Nemastylis acuta (Bart.) Herb., See Nemastylis geminiflora Nutt.
- Nemastylis geminiflora Nutt.
- Nemastylis Nutt.
- Nemexia ecirrata (Engelm. ex Kunth) Small, See Smilax ecirrata (Engelm. ex Kunth) S. Wats.
- Nemexia herbacea (L.) Small, See Smilax herbacea L.
- Nemexia lasioneura (Hook.) Rydb., See Smilax lasioneura Hook.
- Nemexia pulverulenta (Michx.) Small, See Smilax pulverulenta Michx.
- Nemexia Raf., See Smilax L.
- Nemophila paniculata Spreng., See Hydrophyllum appendiculatum Michx.
- Nemophila phacelioides Nutt.
- Neobesseya missouriensis (Sweet) Britton & Rose, See Escobaria missouriensis (Sweet) D.R. Hunt var. missouriensis
- Neobesseya wissmannii (Hildmann ex K. Schum.) Britton & Rose, See Escobaria missouriensis (Sweet) D.R. Hunt var. missouriensis
- Neobesseya Britt. & Rose, See Escobaria Britt. & Rose
- Neobessya missouriensis (Nutt.) Britton & Rose, See Escobaria missouriensis (Sweet) D.R. Hunt var. missouriensis
- Neolepia campestris (L.) W.A. Weber, See Lepidium campestre (L.) Aiton f.
- Neomammillaria missouriensis (Sweet) Britton & Rose, See Escobaria missouriensis (Sweet) D.R. Hunt var. similis (Engelm.) N.P. Taylor
- Neomammillaria radiosa (Engelm.) Rydb., See Escobaria vivipara (Nutt.) Buxbaum var. radiosa (Engelm.) D.R. Hunt
- Neomammillaria similis (Engelm.) Britton & Rose ex Rydb., See Escobaria missouriensis (Sweet) D.R. Hunt var. similis (Engelm.) N.P. Taylor
- Neomammillaria Britton & Rose, See Mammillaria Haw.
- Neoparrya megarrhiza (A. Nels.) W.A. Weber, See Lomatium nuttallii (Gray) J.F. Macbr.
- Neottia cernua (L.) Sw., See Spiranthes cernua (L.) L.C. Rich.
- Nepeta cataria L.
- Nepeta glechoma Benth., See Glechoma hederacea L.
- Nepeta hederacea (L.) Trevisan, See Glechoma hederacea L.
- Nepeta hederacea (L.) Trevisan var. parviflora Benth., See Glechoma hederacea L.
- Nepeta hederacea Trevisan, See Glechoma hederacea L.
- Nepeta L.
- Nephrodium rufidulum Michx., See Woodsia ilvensis (L.) R. Br.
- Neptunia lutea (Leavenworth) Benth.
- Neptunia lutea (Leavenworth) Benth. var. multipinnatifida B.L. Turner, See Neptunia lutea (Leavenworth) Benth.
- Neptunia Lour.
- Neslia paniculata (L.) Desv.
- Nicandra physalodes (L.) Gaertn.
- Nicandra physalodes (L.) Pers., See Nicandra physalodes (L.) Gaertn.
- Nicandra physalodes Gaertn., See Nicandra physalodes (L.) Gaertn.
- Nicandra Adans.
- Nintooa japonica (Thunb.) Sweet, See Lonicera japonica Thunb.
- Nolina texana S. Wats.
- Nopalea Salm-Dyck, See Opuntia P. Mill.
- Norta altissima (L.) Britton, See Sisymbrium altissimum L.
- Norta irio (L.) Britton, See Sisymbrium irio L.
- Norta Adans., See Sisymbrium L.
- Nothocalais cuspidata (Pursh) Greene
- Nothocalais (Gray) Greene
- Nothocalais Greene, See Nothocalais (Gray) Greene
- Nothochlaena, See Notholaena R. Br.
- Nothoholcus lanatus (L.) Nash, See Holcus lanatus L.
- Nothoholcus Nash., See Holcus L.
- Notholaena standleyi Maxon
- Notholaena R. Br.
- Nothoscordum bivalve (L.) Britt.
- Nothoscordum striatumKunth., See Nothoscordum bivalve (L.) Britt.
- Nothoscordum Kunth.
- Nuphar ×interfluitans Fern., See Nuphar lutea (L.) Sm. ssp. advena (Aiton) Kartesz & Gandhi
- Nuphar advena (Aiton) Aiton f. var. fraterna (P. Mill. & Standl.) Standl., See Nuphar lutea (L.) Sm. ssp. variegata (Dur.) E.O. Beal
- Nuphar advena (Aiton) Aiton f. var. tomentosa Torr. & Gray, See Nuphar lutea (L.) Sm. ssp. advena (Aiton) Kartesz & Gandhi
- Nuphar advena Aiton f., See Nuphar lutea (L.) Sm. ssp. advena (Aiton) Kartesz & Gandhi
- Nuphar advena R. Br., See Nuphar lutea (L.) Sm. ssp. advena (Aiton) Kartesz & Gandhi
- Nuphar fluviatilis (Harper) Standl., See Nuphar lutea (L.) Sm. ssp. advena (Aiton) Kartesz & Gandhi
- Nuphar lutea (L.) Sibth. & Sm. ssp. macrophylla (Small) Beal, See Nuphar lutea (L.) Sm. ssp. advena (Aiton) Kartesz & Gandhi
- Nuphar lutea (L.) Sm.
- Nuphar lutea (L.) Sm. ssp. advena (Aiton) Kartesz & Gandhi
- Nuphar lutea (L.) Sm. ssp. ozarkana (Mill. & Standl.) E.O. Beal, See Nuphar lutea (L.) Sm. ssp. advena (Aiton) Kartesz & Gandhi
- Nuphar lutea (L.) Sm. ssp. variegata (Dur.) E.O. Beal
- Nuphar lutea J. E. Smith, See Nuphar lutea (L.) Sm.
- Nuphar luteum Sibth. & Sm., See Nuphar lutea (L.) Sm.
- Nuphar microcarpa (Mill. & Standl.) Standl., See Nuphar lutea (L.) Sm. ssp. advena (Aiton) Kartesz & Gandhi
- Nuphar ovata (Mill. & Standl.) Standl., See Nuphar lutea (L.) Sm. ssp. advena (Aiton) Kartesz & Gandhi
- Nuphar ozarkana (Mill. & Standl.) Standl., See Nuphar lutea (L.) Sm. ssp. advena (Aiton) Kartesz & Gandhi
- Nuphar puteora Fern., See Nuphar lutea (L.) Sm. ssp. advena (Aiton) Kartesz & Gandhi
- Nuphar variegata Dur., See Nuphar lutea (L.) Sm. ssp. variegata (Dur.) E.O. Beal
- Nuphar variegatum Engelm., See Nuphar lutea (L.) Sm. ssp. variegata (Dur.) E.O. Beal
- Nuphar Sm.
- Nuttallanthus canadensis (L.) D.A. Sutton
- Nuttallanthus texanus (Scheele) D.A. Sutton
- Nuttallanthus D.A. Sutton
- Nuttallia decapetala (Pursh ex Sims) Greene, See Mentzelia decapetala (Pursh ex Sims) Urban & Gilg ex Gilg
- Nuttallia decapetala (Pursh) Greene, See Mentzelia decapetala (Pursh ex Sims) Urban & Gilg ex Gilg
- Nuttallia nuda (Pursh) Greene, See Mentzelia nuda (Pursh) Torr. & Gray var. nuda
- Nuttallia reverchonii (Urban & Gilg) W.A. Weber, See Mentzelia reverchonii (Urban & Gilg) Thomps. & Zavortink
- Nuttallia stricta (Osterhout) Greene, See Mentzelia nuda (Pursh) Torr. & Gray var. stricta (Osterhout) Harrington
- Nuttallia Raf., See Mentzelia L.
- Nyctelea nyctelea (L.) Britton, See Ellisia nyctelea (L.) L.
- Nymphaea advena Aiton, See Nuphar lutea (L.) Sm. ssp. advena (Aiton) Kartesz & Gandhi
- Nymphaea advena Soland., See Nuphar lutea (L.) Sm. ssp. advena (Aiton) Kartesz & Gandhi
- Nymphaea chartacea Mill. & Standl., See Nuphar lutea (L.) Sm. ssp. advena (Aiton) Kartesz & Gandhi
- Nymphaea fluviatilis Harper, See Nuphar lutea (L.) Sm. ssp. advena (Aiton) Kartesz & Gandhi
- Nymphaea fraterna P. Mill. & Standl., See Nuphar lutea (L.) Sm. ssp. variegata (Dur.) E.O. Beal
- Nymphaea macrophylla Small, See Nuphar lutea (L.) Sm. ssp. advena (Aiton) Kartesz & Gandhi
- Nymphaea minor (Sims) DC., See Nymphaea odorata Aiton ssp. odorata
- Nymphaea odorata (Dryand.) Woods. & Wood., See Nymphaea odorata Aiton
- Nymphaea odorata Aiton
- Nymphaea odorata Aiton ssp. odorata
- Nymphaea odorata Aiton ssp. tuberos (Paine) Wiersma & Hellquist
- Nymphaea odorata Aiton var. gigantea Tricker, See Nymphaea odorata Aiton ssp. odorata
- Nymphaea odorata Aiton var. godfreyi Ward, See Nymphaea odorata Aiton ssp. odorata
- Nymphaea odorata Aiton var. maxima (Conrad) Boivin, See Nymphaea odorata Aiton ssp. tuberos (Paine) Wiersma & Hellquist
- Nymphaea odorata Aiton var. minor Sims, See Nymphaea odorata Aiton ssp. odorata
- Nymphaea odorata Aiton var. rosea Pursh, See Nymphaea odorata Aiton ssp. odorata
- Nymphaea odorata Aiton var. stenopetala Fern., See Nymphaea odorata Aiton ssp. odorata
- Nymphaea odorata Aiton var. villosa Caspary, See Nymphaea odorata Aiton ssp. odorata
- Nymphaea reniformis DC., See Nymphaea odorata Aiton ssp. tuberos (Paine) Wiersma & Hellquist
- Nymphaea tuberosa Paine, See Nymphaea odorata Aiton ssp. tuberos (Paine) Wiersma & Hellquist
- Nymphaea (Tourn.) L., See Nymphaea L.
- Nymphaea L.
- Nymphaea Tourn., See Nymphaea L.
- Nymphozanthus advena (Aiton) Fern., See Nuphar lutea (L.) Sm. ssp. advena (Aiton) Kartesz & Gandhi
- Nymphozanthus ozarkanus (Mill. & Standl.) Palmer & Steyermark, See Nuphar lutea (L.) Sm. ssp. advena (Aiton) Kartesz & Gandhi
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