NABALUS (Family: Asteraceae)

Nabalus albus (Linnaeus) Hooker - White Lettuce. 2n = 32.

Rich woods, thickets, mostly moist. [Prenanthes alba Linnaeus]

Nabalus altissimus (Linnaeus) Hooker - 2n = 16.

Rich, moist woods, shaded roadsides. [Prenanthes altissima Linnaeus]

Nabalus boottii de Candolle - Alpine Rattlesnake-root. 2n = 32.

Alpine areas. [Prenanthes boottii (de Candolle) D. Dietrich]

Nabalus racemosus (Michaux) Hooker - Glaucous White Lettuce. 2n = 16.

River shores. [Prenanthes racemosa Michaux]

Nabalus serpentarius (Pursh) Hooker - Cankerweed. 2n = 16.

Dry, open woods, clearings, woodland borders. [Prenanthes serpentaria Pursh]

Nabalus trifoliolatus Cassini - 2n = 16.

Open woods, thickets, clearings. [N. trifoliatus var. nanus (Bigelow) Weakley; Prenanthes trifoliolata (Cassini) Fernald; P. trifoliolata var. nana (Bigelow) Fernald]

Nabalus hybrid

Nabalus X mainensis (A. Gray) Heller (pro species) - .

[N. racemosus (Michaux) Hooker X N. trifoliolatus Cassini; Prenanthes X mainensis A. Gray]

NAJAS (Family: Hydrocharitaceae)

Najas flexilis (Willdenow) Rostkovius & W.L.E. Schmidt - Northern Water-nymph. 2n = 24.

Quiet, shallow water of ponds and streams, usually rooting in mud. [The cryptic species N. canadensis Michaux is not generally separated from N. flexilis in the major herbaria and would be included among the specimens mapped here.]

Najas gracillima (A. Braun ex Engelmann) Magnus - . 2n = 12.

Muddy, sandy or sphagnous ponds and shores.

Najas guadalupensis (Sprengel) Magnus subsp. guadalupensis - Southern Water-nymph. 2n = 24.

Ponds and streams.

Najas guadalupensis (Sprengel) Magnus subsp. olivacea (Rosendahl & Butters) R.R. Haynes & Hellquist - . 2n = ?.

Habitat? [N. olivacea Rosendahl & Butters]

NAJAS MINOR Allioni - . 2n = (12), 24, (46), (56).

Quiet, basic water of lakes and streams. From the Old World.

NAPAEA (Family: Malvaceae)

NAPAEA DIOICA Linnaeus - Glade-mallow. 2n = ca. 30.

Roadsides, railroads. From farther west and south.

NARCISSUS (Family: Amaryllidaceae)

NARCISSUS POETICUS Linnaeus - Poet's Narcissus. 2n = 14, (21).

Fields, moist meadows. From Europe.    CONN herbarium image

NARCISSUS PSEUDONARCISSUS Linnaeus - Daffodil. 2n = 14, 14 + (1-2)B, 21 + (0-1)B, 28, (29), (42), (43).

Fields, open groves, moist meadows. From Europe.    MASS herbarium image

NARDUS (Family: Poaceae)

NARDUS STRICTA Linnaeus - Moor Matgrass. 2n = (24), 26.

Old fields, grassy riverbanks. From Europe.

NASTURTIUM (Family: Brassicaceae)

NASTURTIUM MICROPHYLLUM Boenninghausen ex Reichenbach - . 2n = 64.

Brooks. From Europe. [N. OFFICINALE W.T. Aiton var. MICROPHYLLUM (Boenninghausen ex Reichenbach) Beck ex Thellung; RORIPPA MICROPHYLLA (Boenninghausen ex Reichenbach) Hylander ex Á. Löve & D. Löve]

NASTURTIUM OFFICINALE W.T. Aiton - True Water-cress. 2n = 32.

Brooks, ditches, springheads. From Eurasia, northern Africa. [N. OFFICINALE var. SIIFOLIUM Reiche; RORIPPA NASTURTIUM-AQUATICUM (Linnaeus) Hayek]

Nasturtium hybrid

NASTURTIUM X STERILE (Airy Shaw) Oefelein - .

[N. MICROPHYLLUM Boenninghausen ex Reichenbach X N. OFFICINALE W.T. Aiton; RORIPPA X STERILIS Airy Shaw]

NAVARRETIA (Family: Polemoniaceae)

NAVARRETIA LEUCOCEPHALA Bentham subsp. MINIMA (Nuttall) A.G. Day - . 2n = 18.

Wool waste. From western United States.

NELUMBO (Family: Nelumbonaceae)

Nelumbo lutea Willdenow - American Lotus. 2n = 16.

Ponds, quiet streams.

NEOTTIA (Family: Orchidaceae)

Neottia auriculata (Wiegand) Szlachetko - Auricled Twayblade. 2n = ?.

Moist woods and thickets. [Listera auriculata Wiegand]

Neottia bifolia (Rafinesque) Baumbach - Southern Twayblade. 2n = ?.

Sphagnous thickets and bogs. [Listera australis Lindley]

Neottia convallarioides (Swartz) Richard - Broad-lipped Twayblade. 2n = 36.

Wet or swampy woods, often with Thuja, shores. [Listera convallarioides (Swartz) Elliott]

Neottia cordata (Linnaeus) Richard - Heartleaf Twayblade. 2n = 34 + (0 - 4)B, 38, 39-42, (44).

Mossy knolls in wet woods. [Listera cordata (Linnaeus) R. Brown]

Neottia hybrid

Neottia X veltmanii (Case) Baumbach - .

[N. auriculata (Wiegand) Szlachetko X N. convallarioides (Swartz) Richard; Listera X veltmanii Case]

NEPETA (Family: Lamiaceae)

NEPETA CATARIA Linnaeus - Catnip. 2n = 34, 36.

Fields, waste places, roadsides, deciduous woodlands. From Eurasia.

NESLIA (Family: Brassicaceae)

NESLIA PANICULATA (Linnaeus) Desvaux - Ball-mustard. 2n = 14, 28.

Railroads, waste places, fields, roadsides. From Eurasia, northern Africa.

NICANDRA (Family: Solanaceae)

NICANDRA PHYSALODES (Linnaeus) Gaertner - Apple-of-Peru. 2n = 20.

Waste places, roadsides. From Peru.

NICOTIANA (Family: Solanaceae)

NICOTIANA ALATA Link & Otto - Jasmine Tobacco. 2n = 18.

Waste places, roadsides. From South America. [N. AFFINIS T. Moore]

NICOTIANA LANGSDORFII Weinmann - . 2n = 18, 36.

Waste places. From South America.

NICOTIANA LONGIFLORA Cavanilles - . 2n = 20.

Waste places. From South America.

NICOTIANA QUADRIVALVIS Pursh - . 2n = 48.

Wool waste. From farther west. [N. QUADRIVALVIS var. BIGELOVII (Torrey) DeWolf]

NICOTIANA RUSTICA Linnaeus - Aztec Tobacco. 2n = 48.

Fields, roadsides, waste places. From western South America.

NICOTIANA TABACUM Linnaeus - Common Tobacco. 2n = 24, 48.

Fields, waste places. From tropical America.

NIGELLA (Family: Ranunculaceae)

NIGELLA DAMASCENA Linnaeus - Love-in-a-mist. 2n = 12, (14).

Waste ground. From Eurasia.

NIGELLA SATIVA Linnaeus - Black Caraway. 2n = 12, (24).

Waste ground. From Eurasia.

NIPPONANTHEMUM (Family: Asteraceae)

NIPPONANTHEMUM NIPPONICUM (Franchet ex Maximowicz) Kitamura - Montauk Daisy. 2n = 18.

Beaches. From Japan. [CHRYSANTHEMUM NIPPONICUM (Franchet ex Maximowicz) Sprenger]

NONEA (Family: Boraginaceae)

NONEA ROSEA (M. von Bieberstein) Link - . 2n = ?

Waste places. From southeastern Europe.

NUPHAR (Family: Nymphaeaceae)

Nuphar advena (Aiton) W.T. Aiton subsp. advena - Southern Yellow Pond-lily. 2n = 34.

Quiet water of streams, ponds and lakes. [N. lutea (Linnaeus) Smith subsp. advena (Aiton) Kartesz & Gandhi]

Nuphar microphylla (Persoon) Fernald - Small Yellow Pond-lily. 2n = 34.

Quiet water of streams, ponds and lakes. [N. lutea (Linnaeus) Smith subsp. pumila (Timm) E.O. Beal]

Nuphar variegata Engelmann ex Durand - Bullhead-lily. 2n = 34.

Ponds and quiet water of streams. [N. lutea (Linnaeus) Smith subsp. variegata (Engelmann ex Durand) E.O. Beal]

Nuphar hybrid

Nuphar X rubrodisca Morong - .

[N. microphylla (Persoon) Fernald X N. variegata Engelmann ex Durand; N. lutea (Linnaeus) Smith subsp. rubrodisca (Morong) Hellquist & Wiersema]

NUTTALLANTHUS (Family: Plantaginaceae)

Nuttallanthus canadensis (Linnaeus) D.A. Sutton - Old-field Toadflax. 2n = 12.

Sandy soil, waste places. [Linaria canadensis (Linnaeus) Dumont de Courset]

NYMPHAEA (Family: Nymphaeaceae)

Nymphaea leibergii Morong - Pygmy Water-lily. 2n = 84, 112.

Pond and lake margins. [N. tetragona misapplied]

Nymphaea odorata Aiton subsp. odorata - Fragrant Water-lily. 2n = 42, 56, 84.

Ponds, quiet water. [N. odorata var. gigantea Tricker]

Nymphaea odorata Aiton subsp. tuberosa (Paine) Wiersema & Hellquist - Magnolia Water-lily. 2n = ?

Ponds, quiet water. [N. tuberosa Paine]

Nymphaea hybrid

Nymphaea leibergii Morong X N. odorata Aiton subsp. odorata - .

NYMPHOIDES (Family: Menyanthaceae)

Nymphoides cordata (Elliott) Fernald - . 2n = 36.

Ponds, lakes, slow streams.

NYMPHOIDES PELTATA (S.G. Gmelin) Kuntze - Yellow Floating-heart. 2n = 54, 56.

Ponds. From Eurasia. [N. FLAVA Druce -- illegitimate name]

NYSSA (Family: Nyssaceae)

Nyssa sylvatica Marshall - Black Tupelo. 2n = 44.

Swamps, shores, low, acidic woodlands.

Designed by Ray Angelo. Revised May 5, 2023