Flora of New York/Acorales & Alismatales

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Nymphaeales & magnoliids
Flora of New York — Acorales & Alismatales
Dioscoreales & Liliales
Table of
contents
Genus
index
Protected species index Invasive species index


Order Family Subfamily Tribe Genera G T
Acorales Acoraceae Acorus (sweetflag) 1 2
Alismatales Araceae Orontioideae Orontieae Orontium (duckweed) 1 1
Symplocarpeae Symplocarpus (skunk cabbage) 1 1
Lemnoideae Lemna (duckweed)
Spirodela (duckmeat)
Wolffia (watermeal)
3 10
Aroideae Calleae Calla (callalily) 1 1
Peltandra Peltandra (arrow-arum) 1 1
Arisaemateae Arisaema (Jack-in-the-pulpit)
Pinellia (green dragon)
2 5
Pistieae Pistia (water-lettuce) 1 1
Tofieldiaceae Triantha (Tofieldia) 1 1
Hydrocharitaceae Hydrocharitoideae Egeria (waterweed)
Hydrocharis (frogbit)
Limnobium (spongeplant)
3 3
Anacharidoideae Elodea (waterweed) 1 3
Najadoideae Najadeae Najas (waternymph, naiad)
Hydrilla (water-thyme)
2 8
Vallisnerieae Vallisneria (eelgrass) 1 1
Butomaceae Butomus (flowering rush) 1 1
Alismataceae Sagittaria (arrowhead)
Alisma (water-plantiain)
Helanthium (burhead)
3 12
Scheuchzeriaceae Scheuchzeria (rannoch-rush) 1 1
Juncaginaceae Juncaginoideae Triglochin (arrowgrass) 1 2
Zosteraceae Zostera (eelgrass) 1 1
Zannichelliaceae Zannichellia (horned-pondweed) 1 1
Potamogetonaceae Potamogeton (pondweed)
Stuckenia (fineleaf pondweed)
2 35
Ruppiaceae Ruppia (ditch-grass) 1 1

Order Acorales[edit]

The order Acorales consists of only the Acoraceae (sweetflag family), with Acorus as its only genus.[1]

Family Acoraceae[edit]

Genus Acorus[edit]

Acorales – fam. Acoraceae – genus Acorus
Acorus Sweetflag N.Y. Status Images Distribution 2
 (Raf.) Raf.

1828. Acorus calamus var. americanus
1836. Acorus americanus (Raf.) Raf.
1954. Acorus calamus var. americanus
auct. Acorus calamusnon L.
American sweet-flag,
American sweetflag,
Several-veined sweetflag,
Sweetflag

Acore d'Amérique,
Acorus d'Amérique,
Belle-angélique
Native, CoC: 5,
Secure,
Fertile diploid
 (2n = 2x = 24)

WL: OBL

Perennial,
Herb-forb,
Sun
Acorus americanus USFS-1.jpg
Acorus americanus nymap.svg
NYFA-5
USDA-N
NEW Can
ARS ITIS
FNA Trop.
NSE BNA 
LBJ 
Images, wsp
 L.

1753. Acorus calamus L.
Old World sweet-flag,
European sweetflag,
Single-veined sweetflag,
Flag-root,
Myrtle flag

Acore roseau,
Acorus roseau,
Acore aromatique,
Belle-angélique
Introduced, CoC: 0 from
 Asia,
Sterile triploid
 (2n = 3x = 36)

WL: OBL

Perennial,
Herb-forb,
Sun
Acorus calamus kz4.JPG
Acorus calamus nymap.svg
NYFA-X
USDA-X
NEW Can
ARS ITIS
FNA Trop.
NSE BNA 

Images, wsp

Order Alismatales[edit]

The order Alismatales as defined in the Angiosperm Phylogeny Website.[1]

Family Araceae[edit]

The Araceae (arum family)...

Subfamily Orontioideae[edit]

Tribe Orontieae[edit]

Genus Orontium[edit]
Alismatales – fam. Araceae – subfam. Orontioideaetribe Orontieae
Orontium Goldenclub N.Y. Status Images Distribution 1
L.

1753. Orontium aquaticum L.
1895. Aronia aquatica (L.) Baill.
Golden club Native, CoC: 9,
Threatened,
NYNHP: 2[2]

WL: OBL

Perennial,
Herb-forb,
Part shade
Orontium aquaticum detail 03.jpg
Orontium aquaticum NY-dist-map.png
NYFA-2
USDA-N0

ARS 
Trop.

LBJ 
Images, wsp

Tribe Symplocarpeae[edit]

Genus Symplocarpus[edit]
Alismatales – fam. Araceae – subfam. Orontioideae – tribe Symplocarpeae
Symplocarpus Skunk-cabbage N.Y. Status Images Distribution 1
 (L.) W.Salisb.

1753. Dracontium foetidum L.
1808. Spathyema foetida (L.) Raf. nom. inval.
1812. Symplocarpus foetidus (L.) W.Salisb.
1817. S. foetidus (L.) Salisb. ex W.P.C.Barton
Skunk cabbage,
Polecatweed

Chou puant,
Tabac-du-diable
Native, CoC: 5,
Secure

WL: OBL

Perennial,
Herb-forb,
Shade
Skunk Cabbage Symplocarpus foetidus Plant.JPG
Symplocarpus foetidus NY-dist-map.png
NYFA-5
USDA-NN

ARS 
FNA Trop.

LBJ 
Images, wsp

Subfamily Lemnoideae[edit]

Genus Spirodela[edit]

The Lemnoideae contains the small aquatic plants known as duckweeds, or water lentils.

Alismatales – fam. Araceae – subfam. Lemnoideae – genus Spirodela
Spirodela Duckmeat N.Y. Status Images Distribution 1
 (L.) Schleid.

1753. Lemna polyrhiza L.
1839. Spirodela polyrhiza Schleid.
1839. Spirodela polyrrhiza Schleid.[1]
Common water-flaxseed,
Common duck-meal,
Common duck-meat,
Greater duckweed,
Giant duckweed

Spirodèle polyrhize
Native,
Secure

WL: OBL

Perennial,
Herb-forb
Spirodela polyrhiza 01.JPG
Nymap.svg
NYFA-5
USDA-NN
NEW Can
ARS ITIS
FNA Trop.
NSE BNA 

Images, wsp
  1. "The initial ρ of a Greek word transliterated as rh, e.g. rhiza (ριζα, root, rhizome), should have an additional r added to it when preceded by a vowel, e.g. Glycyrrhiza (γλυκυρριζα, liquorice, from γλυκος, sweet, ριζα, root), leptorrhiza (λεπτορριζα, with a thin root, from λεπτος, small, slender), but as many reputable authors, Linnaeus among them, have omitted this additional r, it is best regarded as optional and an author's original spelling, as in Lemna polyrhiza, should be accepted." - W. T. Stearn (1992), Botanical Latin ed. 4: 261.

Genus Lemna[edit]

Alismatales – fam. Araceae – subfam. Lemnoideae – genus Lemna
Lemna Duckweed N.Y. Status Images Distribution 6
 L.

     L. cyclostasa Ell. ex Schleid.
     L. minima Chev. ex Schleid.
Lesser duckweed Native,
Secure
Kleine Wasserlinse (Entengrütze).JPG
Lemna minor NY-dist-map.png
NYFA-5
USDA-NN





Images, wsp
 L.
Star duckweed Native,
Secure
Lemna trisulca NRCS-1.jpg
Lemna trisulca NY-dist-map.png
NYFA-5
USDA-NN





Images, wsp
 Torr.
Minute duckweed Native,
Endangered,
NYNHP: 1[1]
Lemna perpusilla 3.JPG
Lemna perpusilla NY-dist-map.png
NYFA-1
USDA-NN





Images, wsp
 Phil.
Pale duckweed,
Valdivia duckweed
Native,
Endangered,
NYNHP: 1[2]
Lemna valdiviana NRCS-001 (4x3).jpg
Nymap.svg
NYFA-1
USDA-NN





Images, wsp
 (Austin) Daubs

     L. minor var. obscura Austin
Little duckweed Native,
Unranked
Aguas del lago de Maracaibo contaminadas por Lemna 02.JPG
No counties NY-dist-map.png
NYFA-U
USDA-N0





Images, wsp
 Landolt
Turion duckweed,
Lenticulare turionifère
Native,
Unranked
Lemna turionifera.jpg
No counties NY-dist-map.png
NYFA-U
USDA-NN

ITIS



Images, wsp

Genus Wolffia[edit]

The genus Wolffia (watermeal) contains the world's smallest flowering plants, each an undifferentiated, rootless floating body.

Alismatales – fam. Araceae – subfam. Lemnoideae – genus Wolffia
WolffiaHorkel ex Schleiden Watermeal N.Y. Status Images Distribution 3
 H.Karst.

1865. Wolffia columbiana H.Karst
1892. Grantia columbiana (H.Karst.) MacMill.
1912. Bruniera columbiana (H.Karst.) Nieuwl.
Columbian watermeal,
Columbia watermeal,
Columbian duckmeal

Wolffie de Colombie
Native,
Secure
Wolffia columbiana BB-1913.png
Nymap.svg
NYFA-5
USDA-NN
NEW Can




Images, wsp
 (Engelm.) Landolt & Wildi
ex Gandhi, Wiersema & Brouillet

1867. W. brasiliensis var. borealis Engelm.
1977. Wolffia borealis Landolt & … nom. inval.
2012. Wolffia borealis … ex Ghandhi, …
 auct. Wolffia punctata
Dotted watermeal,
Northern watermeal,
Northern duckmeal

Wolffie borèle
Native,
Likely secure
Wolffia borealis NY-dist-map.png
NYFA-4
USDA-NN
NEW 
ARS ITIS
FNA Trop.


Images, wsp
 Wedd.

     Bruniera punctata
     Wolffia punctata Griseb.
     Wolffia papulifera
Brazilian watermeal Native,
Likely secure
Wolffia brasiliensis BB-1913-1.pngImg spacer 2x87.pngWolffia brasiliensis BB-1913-2.png
Wolffia brasiliensis NY-dist-map.png
NYFA-4
USDA-N0
NEW 
ARS ITIS
FNA 


Images, wsp

Subfamily Aroideae[edit]

Tribe Calleae[edit]

Genus Calla[edit]
Alismatales – fam. Araceae – subfam. Aroideaetribe Calleae
Calla Callalily N.Y. Status Images Distribution 1
 L.

1753. Calla palustris L.
Wild calla,
Water arum

Calla des marais
Native,
Secure

WL: OBL

Perennial,
Herb-forb
Calla palustris 7867.jpg
Nymap.svg
NYFA-5
USDA-NN
NEW Can
ARS ITIS
FNA 


Images, wsp

Tribe Peltandreae[edit]

Genus Peltandra[edit]
Alismatales – fam. Araceae – subfam. Aroideae – tribe Peltandreae
Peltandra Arrow-arum N.Y. Status Images Distribution 1
Green arrow-arum,
Tuckahoe
Native,
Secure
Peltandra virginica MA.jpg
Nymap.svg
NYFA-5
USDA-NN





Images, wsp

Tribe Arisaemateae[edit]

Genus Arisaema[edit]
Two species of Arisaema are native to New York: A. triphyllum (Jack-in-the-Pulpit) and A. dracontium (Green dragon).
Three subspecies of Jack-in-the-Pulpit have been reported in New York. A. triphyllum ssp. triphyllum, a tetraploid with 2n:56 chromosomes, likely originated as a hybrid of subspecies stewardsonii and pusillum, each of which is a diploid with 2n:28 chromosomes.[1]
Alismatales – fam. Araceae – subfam. Aroideae – tribe Arisaemateae – genus Arisaema
ArisaemaMart.sect. Pedatisecta[2] Jack-in-the-pulpit N.Y. Status Images Distribution 4
 (L.) Schott
ssp. triphyllum

1753. Arum triphyllum L.
1832. Arisaema triphyllum (L.) Schott
1835. Arisaema atrorubens (Aiton) Blume
Common Jack-in-the-pulpit,
Indian Jack-in-the-pulpit,
Indian-turnip

Arisème petit-prêcheur
Native,
Secure
Arisaema triphyllum SCA-01641.jpg
Arisaema triphyllum ssp triphyllum NY-dist-map.png
NYFA-5
USDA-N
NEW Can

FNA Trop.


Images, wsp
ssp. stewardsonii (Britton) Huttl.

1901. Arisaema stewardsonii Britton
1910. A. triphyllum var. stewardsonii Stevens
1920. A. triphyllum fo. stewardsonii Engl.
1949. A. triphyllum ssp. stewardsonii Huttl.
Swamp Jack-in-the-pulpit,
Stewardson's Jack...

Arisème de Stewardson,
Arisèma de Stewardson
Native,
Secure
Arisaema triphyllum ssp. stewardsonii.png
Arisaema triphyllum ssp stewardsonii NY-dist-map.png
NYFA-5
USDA-N
Can

FNA Trop.


Images, wsp
ssp. pusillum (Peck) Huttl.

1898. A. triphyllum var. pusillum Peck
1901. Arisaema pusillum (Peck) Nash
1903. Arisaema acuminatum Small
1921. A. triphyllum var. acuminatum Engl.
1940. A. triphyllum fo. pusillum Fernald
1949. A. triphyllum ssp. pusillum Huttl.
Small jack-in-the-pulpit,
Peck's jack-in-the-pulpit

Arisème nain
Native,
Vulnerable
Arisaema triphyllum ssp. pusillum.png
Arisaema triphyllum ssp pusillum NY-dist-map.png
NYFA-3
USDA-N
Can

FNA Trop.


Images, wsp
ArisaemaMart.sect. Tortuosa[2] Green-dragon N.Y. Status Images Distribution 4
 (L.) Schott

1753. Arum dracontium L.
1832. Arisaema dracontium (L.) Schott
1903. Muricauda dracontium (L.) Small
Green dragon,
Dragon root,
Dragon arum

Arisème dragon,
Arisèma dragon
Native,
Likely secure
Arisaemadracontium.jpg
Arisaema dracontium NY-dist-map.png
NYFA-4
USDA-NN
NEW Can
ARS 
FNA Trop.


Images, wsp
Genus Pinellia[edit]
Alismatales – fam. Araceae – subfam. Aroideae – tribe Arisaemateae – genus Pinellia
Pinellia Pinellia N.Y. Status Images Distribution 1
Crowdipper,
Green dragon
Introduced
Puanh ghrah hrua.jpg
Pinellia ternata NY-dist-map.png
NYFA-X





Images, wsp

Tribe Pistieae[edit]

Genus Araceae[edit]
Alismatales – fam. Araceae – subfam. Aroideae – tribe Pistieae
Pistia Water-lettuce N.Y. Status Images Distribution 1
 L.

1753. Pistia stratiotes L.
1803. Pistia spathulata Michx.
1878. Pistia stratiotes var. spathulata (i)
Water-lettuce,
Tropical duckweed,
Nile cabbage

Laitue d'eau
Introduced from
 US South,
 South America,
 Africa,
Potentially invasive,
NYIS: 62%[1],
Impersistent
Starr 061108-9789 Pistia stratiotes.jpg
Pistia stratiotes nymap.svg
NYFA-X
USDA-N0
Can
ARS ITIS
Trop.


Images, wsp

Family Tofieldiaceae[edit]

Genus Triantha[edit]

Alismatales – fam. Tofieldiaceae
Triantha Tofieldia N.Y. Status Images Distribution 1
 (Michx.) Baker
Sticky false-asphodel Native,
Endangered
Triantha glutinosa (14604232827).jpg
Triantha glutinosa NY-dist-map.png
NYFA-1
USDA-NN





Images, wsp

Family Alismataceae[edit]

The Alismataceae (water-plantain family) has about a dozen documented taxa in three genera growing outside of cultivation in New York.

Genus Sagittaria[edit]

Alismatales – fam. Alismataceae – subtr. Sagittaria
Sagittaria Arrowhead N.Y. Status Images Distribution 8
Broad-leaved arrowhead,
Wapato,
Common arrowhead,
Duck-potato
Native, CoC: 3,
Secure

WL: OBL

Perennial,
Herb-forb
Sagittaria latifolia 1 (5097358241).jpg
Sagittaria latifolia NY-dist-map.png
NYFA-5
USDA-N





Images, wsp
Sessile-fruited arrowhead Native, CoC: 6,
Secure

WL: OBL

Perennial,
Herb-forb
Sagittaria rigida drawing.png
Sagittaria rigida NY-dist-map.png
NYFA-5
USDA-N





Images, wsp
ssp. graminea
Grass-leaved arrowhead Native, CoC: 8,
Secure

WL: OBL

Perennial,
Herb-forb
Sagittaria graminea.jpg
Sagittaria graminea ssp graminea NY-dist-map.png
NYFA-5
USDA-N





Images, wsp
Northern arrowhead,
Wapato,
Wapatum arrowhead
Native, CoC: 6,
Secure

WL: OBL

Perennial,
Herb-forb
Fig. 04 Sagittaria cuneata 4x3.jpg
Sagittaria cuneata NY-dist-map.png
NYFA-5
USDA-NN





Images, wsp
Acid-water arrowhead,
Engelmann arrowhead
Native, CoC: 9,
Likely secure

WL: OBL

Perennial,
Herb-forb
Sagittaria engelmanniana drawing.png
Sagittaria engelmanniana NY-dist-map.png
NYFA-4
USDA-N





Images, wsp
Strap-leaved arrowhead Native, CoC: 7,
Rare

WL: OBL

Perennial,
Herb-forb
Sagittaria subulata drawing.png
Sagittaria subulata NY-dist-map.png
NYFA-3
USDA-N





Images, wsp
ssp. spongiosa

Lophotocarpus spathulatus
Lophotocarpus spongiosus
Sagittaria spathulata
S. calycina var. spongiosa
Spongy-leaved arrowhead,
Tidal arrowhead,
Spongy arrowhead,
Hooded arrowhead
Native, CoC: 7,
Threatened

WL: OBL

Annual,
Herb-forb
Sagittaria montevidensis 002.JPG
Sagittaria montevidensis ssp spongiosa NY-dist-map.png
NYFA-2
USDA-N


FNA 


Images, wsp
Slender arrowhead,
Quill-leaved sagittaria
Native, CoC: 10,
Endangered

WL: OBL

Perennial,
Herb-forb
Sagittaria teres drawing.png
Sagittaria teres NY-dist-map.png
NYFA-1
USDA-N


FNA 


Images, wsp
 (J.G.Sm.) Small

1897. S. longirostra var. australis J.G.Sm.
1903. Sagittaria australis (J.G.Sm.) Small
auct. Sagittaria engelmanniana
   ssp.
longirostranon Micheli 1955
auct. Sagittaria longirostranon J.G.Sm.
Longbeak arrowhead,
Appalachian arrowhead
Native,
Excluded
Sagittaria australis Mohr-1901.png
Nymap.svg
NYFA-Excl.
USDA-N

ARS 
FNA Trop.


Images, wsp

Genus Alisma[edit]

Alismatales – fam. Alismataceae – subtr. Alisma
Alisma Water-plantain N.Y. Status Images Distribution 3

    
    
    
Southern water-plantain,
Broad-leaved water-plantain
Native, CoC: 4,
Secure

WL: OBL

Perennial,
Herb-forb
Alisma subcordatum leaves.jpg
Alisma subcordatum NY-dist-map.png
NYFA-5
USDA-N
NEW 




Images, wsp

    
    
    
Northern water-plantain Native, CoC: 4,
Secure

WL: OBL

Perennial,
Herb-forb
Alisma triviale.jpgImg spacer 2x87.pngAlisma triviale drawing.png
Alisma triviale NY-dist-map.png
NYFA-5
USDA-N
NEW 




Images, wsp
Lej.

    
    
    
Narrow-leaved water-plantain,
Grass-leaved water-plantain,
Ribbonleaf water-plantain
Native, CoC: 7,
Threatened

WL: OBL

Perennial,
Herb-forb
Alisma gramineum drawing.pngImg spacer 2x87.pngAlisma gramineum plant.jpg
Alisma gramineum NY-dist-map.png
NYFA-2-3
USDA-N
NEW 




Images, wsp

Genus Helanthium[edit]

Alismatales – fam. Alismataceae – subtr. Helanthium
Helanthium Burhead N.Y. Status Images Distribution 1
(Mart. ex Schult.f.) Britton

1830. Alisma tenellum Mart. ex Schult.f.
1856. Echinodorus parvulus Engelm.
1868. Echinodorus tenellus Buchenau
1905. Helanthium tenellum Britton
North American
  dwarf burhead,
Mud-babies,
Pygmy chain sword
Native,
Likely extirpated
Helanthium tenellum - Mutis-2.png
Helanthium tenellum nymap.svg
NYFA-Z
USDA-NN
NEW 
ARS ITIS
FNA Trop.


Images, wsp

Family Butomaceae[edit]

Butomus umbellatus

Genus Butomus[edit]

The sole species of Butomaceae (the flowering rush family) is the aquatic Eurasian plant Butomus umbellatus, which is listed as moderately invasive in New York. Its first appearance in North America was in the St. Laurence River in 1897, and it is now a problem weed in the Great Lakes.[1]

Studies by L. C. Anderson in 1974 found that the naturalized North American Butomus populations had separate sources. Those east of Niagara Falls, introduced near the St. Lawernce River, originated in eastern Asia. Those west of the Falls were introduced near Detroit, and were from western Euraasia. R. L. Stuckey, in 1994, recognized these two groups as separate species, with B. umbellatus, from western Eurasia, found west of the Falls, and B. junceus, from eastern Asia, found east of the falls. [2] B. junceus is not widely accepted as a separate species at this time, but if it were to be accepted, New York's populations would probably be considered to be B. junceus.[3][4]

Alismatales – fam. Butomaceae – genus Butomus
Butomus Flowering rush N.Y. Status Images Distribution 1
 L.

1753. Butomus umbellatus L.
1837. Butomus junceus Turcz.
Flowering rush,
Water gladiolus,
Grass rush

Butome à ombelle,
Jonc fleuri
Introduced from
 Eurasia,
 northern Africa,
Moderately invasive,
NYIS: 64%[5],
NE-1[6]
ButomusUmbellatus2.jpg
Butomus umbellatus nymap.svg
NYFA-X
USDA-X
NEW Can
ARS ITIS
FNA Trop.
NSE BNA 
IPN 
Images, wsp
  1. Go Botany - New England Wild Flower Society
  2. Flora of North America, www.eFloras.org
  3. Weldy, Troy, David Werier, and Andrew Nelson (2014) New York Flora Atlas. New York Flora Association, Albany, New York.
  4. Cao, L., L. Berent, and A. Fusaro (2014). Butomus umbellatus. USGS Nonindigenous Aquatic Species Database, Gainesville, FL.
  5. New York non-native plant invasiveness assessmentButomus umbellatus: Moderate (64). M.J.Jordan, G.Moore & T.W.Weldy (2008). Invasiveness ranking system for non-native plants of New York. Unpublished. The Nature Conservancy, Albany & Cold Spring Harbor, NY; Brooklyn Botanic Garden, Brooklyn, NY.
  6. Category 1 Plants - highly invasive - Eastern Region invasive plants, ranked by degree of invasiveness as based on information from States (1998) US Forest Service

Family Hydrocharitaceae[edit]

The Hydrocharitaceae (tape-grass family) ...

Subfamily Hydrocharitoideae[edit]

Genus Hydrocharis[edit]

Alismatales – fam. Hydrocharitaceae – subfam. Hydrocharitoideae – genus Hydrocharis
Hydrocharis Frog-bit N.Y. Status Images Distribution 1
 L.

1753. Hydrocharis Morsus ranae L.
1827. Pontederia dubia Blume
1925. H. dubia (Blume) Backer
Common frogbit,
European frog-bit,
Frog's bit

Hydrocharide grenouillette,
Grenouillette,
Morène,
Petit nénuphar
Introduced from
 Eurasia,
 northern Africa,
Very highly invasive,
NYIS: 86%[1],
Prohibited[2]
Hydrocharis.jpg
Hydrocharis morsus-ranae nymap.svg
NYFA-X
USDA-XX
NEW Can
ARS ITIS
FNA Trop.
NSE BNA 
IPN 
Images, wsp
  1. New York non-native plant invasiveness assessmentHydrocharis morsus-ranae: Very high (86). M.J.Jordan, G.Moore & T.W.Weldy (2008). Invasiveness ranking system for non-native plants of New York. Unpublished. The Nature Conservancy, Albany & Cold Spring Harbor, NY; Brooklyn Botanic Garden, Brooklyn, NY.
  2. New York State Department of Environmental Conservation Regulation 6 NYCRR Part 575 Prohibited and Regulated Invasive Species

Genus Egeria[edit]

Alismatales – fam. Hydrocharitaceae – subfam. Hydrocharitoideae – genus Egeria
Egeria Waterweed N.Y. Status Images Distribution 1
 Planch.

1849. Egeria densa Planch.
1857. Elodea densa Casp.
1931. Anacharis densa Vict.
1933. Philotria densa Small
Brazilian waterweed,
Brazilian elodea,
South American waterweed
Introduced from
 Brazil,
Highly invasive,
NYIS: 75%[1],
Prohibited[2],
NE-2[3]
Egeria densa detail.jpeg
Egeria densa nymap.svg
NYFA-X
USDA-XW
NEW Can
ARS ITIS
FNA Trop.


Images, wsp

Genus Limnobium[edit]

Alismatales – fam. Hydrocharitaceae – subfam. Hydrocharitoideae – genus Limnobium
LimnobiumRich. 1814 Spongeplant N.Y. Status Images Distribution 1
(Bosc) Rich. ex Steud.

1807. Hydrocharis spongia Bosc
1814. Limnobium spongia Rich.
1818. Hydrocharis cordifolia Nutt.
1840. Limnobium spongia Steud.
American frogbit,
American spongeplant
Introduced,
US South native,
Impersistent
Limnobium spongia BB-1913.png
Limnobium spongia NY-dist-map.png
NYFA-X
USDA-N0

ARS ITIS
FNA Trop.


Images, wsp

Subfamily Stratiotoideae[edit]

Genus Stratiotes[edit]

Alismatales – fam. Hydrocharitaceae – subfam. Stratiotoideae – genus Stratiotes
Stratiotes Water-aloe N.Y. Status Images Distribution 0
 L.

1753. Stratiotes aloides L.
Water-soldiers,
Water-aloe

Stratiote faux-aloès,
Faux-aloès,
Aloès d'eau
Introduced from
 Eurasia,
Potentially invasive,
NYIS: Not ranked[1]
Water soldier plants.JPG
Stratiotes aloides nymap.svg

USDA-00
Can
ARS ITIS
Trop.
BNA 

Images, wsp
Note: CA

Subfamily Anacharidoideae[edit]

Genus Elodea[edit]

Alismatales – fam. Hydrocharitaceae – subfam. Anacharidoideae
Elodea Waterweed N.Y. Status Images Distribution 3
L.Rich. ex Michx.
Canadian waterweed,
Common waterweed,
Broad waterweed
Native,
Secure
ElodeaCanadensisFlowering.jpg
Elodea canadensis NY-dist-map.png
NYFA-5
USDA-NN





Images, wsp
(Planch.) St. John
Nuttall's waterweed Native,
Secure
ElodeaNuttallii2.jpg
Elodea nuttallii NY-dist-map.png
NYFA-5
USDA-NN





Images, wsp
 H.St.John

E. longivaginata H.St.John
E. nevadensis (Planch.) H,St.John
Twoleaf waterweed,
Two-leaved waterweed,
Long-sheath waterweed
Introduced,
Western native
Herne - Kanal - Osthafen 06 ies.jpg
No counties NY-dist-map.png
NYFA-X
USDA-NN





Images, wsp

Subfamily Najadoideae[edit]

Tribe Najadeae[edit]

Genus Najas[edit]
Alismatales – fam. Hydrocharitaceae – subfam. Najadoideae – tribe Najadeae – genus Najas
Najas Waternymph / Naiad N.Y. Status Images Distribution 7
(Willd.) Rostk. & W.L.E.Schmidt

1798. Caulinia flexilis Willd.
1803. Najas canadensis Michx.
1824. N. flexilis Rostk. & W.L.E.Schmidt
1942. N. flexilis ssp. caespitosus
1975. N. caespitosus (Maguire) Reveal
Slender naiad,
Slender naias,
Slender water-nymph,
Nodding water-nymph,
Bushy naiad,
Northern water-nymph,
Wavy waternymph
Native,
Secure
BB-0213 Naias flexilis.png
Nymap.svg
NYFA-5
USDA-NN
NEW 
ARS 
FNA 
NSE 

Images, wsp
(A.Braun ex Engelm.) Magnus

1867. Najas indica var. gracillima
1870. Najas gracillima Magnus
Thread-like naiad,
Thread-like water-nymph,
Slender waternymph
Native,
Likely secure
Najas gracillima seeds.JPG
Nymap.svg
NYFA-4
USDA-NN
NEW 




Images, wsp
(Spreng.) Magnus
ssp. guadalupensis

1825. Caulinia guadalupensis Spreng.
1870. Najas guadalupensis Magnus
Southern water-nymph,
Southern naiad
Native,
Secure
BB-0214 Naias guadalupensis.png
Najas guadalupensis ssp guadalupensis nymap.svg
NYFA-5
USDA-NN
NEW 
ARS ITIS
FNA Trop.


Images, wsp
(Spreng.) Magnus
ssp. muenscheri
(R.T.Clausen) R.R.Haynes & Hellq.

1937. Najas muenscheri R.T.Clausen
1979. N.g. var. muenscheri
1996. N.g. ssp. muenscheri
Hudson River water-nymph,
Muenscher's water-nymph,
Mermaid weed
Native,
Endangered,
NYNHP: 1
Endemic[1]
Najas guadalupensis ssp muenscheri nymap.svg
NYFA-1E
USDA-N0

ITIS
FNA Trop.


Images, wsp
(Spreng.) Magnus
ssp. olivacea
(Rosend. & Butters) R.R.Haynes & Hellq.

1935. N. olivacea Rosend.& Butters
1979. N. guadalupensis var. olivacea
1996. N. guadalupensis ssp. olivacea
Guadalupe water-nymph,
Southern naiad
Native,
Endangered
Najas guadalupensis NRCS-4x3.jpg
Najas guadalupensis ssp olivacea nymap.svg
NYFA-1
USDA-NN
NEW 

FNA Trop.


Images, wsp
 L.

1753. Najas marina L.
1893. Najas gracilis Morong
1903. Najas gracilis Small
Spiny water-nymph,
Spiny naiad,
Holly-leaved naiad,
Prickly waternymph
Native,
Endangered
Najas marina kz1.jpg
Najas marina nymap.svg
NYFA-1
USDA-NN

ARS 
FNA Trop.


Images, wsp
All.

1773. Najas minor All.
1807. Fluvialis minor Pers.
1808. Ittnera minor C.C.Gmel.
1845. Caulinia minor Coss. & Germ.
Brittle water-nymph Introduced from
 Eurasia,
 n. Africa,
Potentially invasive,
[2]
Najas minor NRCS-4x3.jpg
Najas minor nymap.svg
NYFA-X
USDA-XX
NEW 
ARS 
FNA Trop.


Images, wsp
Genus Hydrilla[edit]
Alismatales – fam. Hydrocharitaceae – subfam. Najadoideae – tribe Najadeae – genus Hydrilla
Hydrilla Water-thyme N.Y. Status Images Distribution 1
 (L.f.) Royle

1782. Serpicula verticillata L.f.
1824. Udora verticillata Spreng.
1839. Hydrilla verticillata Royle
1888. Elodea verticillata F.Muell.
Hydrilla,
Florida elodea,
Waterthyme,
Water-thyme,
Esthwaite waterweed
Introduced from
 Eurasia, Africa,
 Australia,
Very highly invasive,
NYIS: 91%[1],
Discovered 2008.[2]
Hydrilla verticillata is it- in Hyderabad W2 IMG 8305.jpg
Hydrilla verticillata nymap.svg
NYFA-X1
USDA-X0
NEW 
ARS ITIS
FNA Trop.


Images, wsp
  1. New York non-native plant invasiveness assessmentHydrilla verticillata: Very high (91).
  2. Three large infestations of Hydrilla were discovered in Orange and Suffolk Counties in 2008.

Tribe Vallisnerieae[edit]

Genus Vallisneria[edit]
Alismatales – fam. Hydrocharitaceae – subfam. Najadoideae – tribe Vallisnerieae
Vallisneria Eelgrass N.Y. Status Images Distribution 1
 Michx.
Eel-grass,
Tape-grass,
Water-celery,
Wild-celery
Native,
Secure
Vallisneria americana UMFS 3.JPG
Vallisneria americana NY-dist-map.png
NYFA-5
USDA-NN





Images, wsp

Family Scheuchzeriaceae[edit]

The monotypic Scheuchzeriaceae (scheuchzeria family)

Genus Scheuchzeria[edit]

Scheuchzeriaceae – genus Scheuchzeria
Scheuchzeria Rannoch-rush N.Y. Status Images Distribution 1
 L.

     S. americana (Fernald) G.N.Jones
     S. palustris var. americana Fernald
American scheuchzeria,
Rannoch-rush
Native,
Vulnerable
Scheuchzeria pal fruits.jpg
Scheuchzeria palustris NY-dist-map.png
NYFA-3
USDA-NN





Images, wsp

Family Juncaginaceae[edit]

The Juncaginaceae (arrowgrass family)

Genus Triglochin[edit]

Alismatales – fam. Juncaginaceae – genus Triglochin
Triglochin Arrowgrass N.Y. Status Images Distribution 2
 L.
Seaside arrowgrass Native,
Likely secure
Triglochin maritimum detail.jpeg
Triglochin maritima NY-dist-map.png
NYFA-4
USDA-NN





Images, wsp
 L.
Slender bog arrow-grass Native,
Threatened
Triglochin palustre detail.jpeg
Triglochin palustris NY-dist-map.png
NYFA-2
USDA-NN





Images, wsp

Family Ruppiaceae[edit]

The Ruppiaceae (ditch-grass family)

Genus Ruppia[edit]

Ruppiaceae
Ruppia Widgeonweed N.Y. Status Images Distribution 1
 L.

1753. Ruppia maritima L.
1915. Buccaferrea maritima Lunell
Ditch-grass,
Beaked ditchgrass,
Widgeongrass,
Sea ditchgrass,
Tassel pondweed

Ruppie maritime,
Persil d'eau
Native,
Vulnerable

WL: OBL

Perennial,
Herb-forb
Ruppia maritima.jpg
Nymap.svg
NYFA-3-4
USDA-NN
NEW Can
ITIS
FNA Trop.
NSE BNA 

Images, wsp

Family Zosteraceae[edit]

The Zosteraceae (eelgrass family)

Genus Zostera[edit]

Zosteraceae
Zostera Eelgrass N.Y. Status Images Distribution 1
 L. (1753)

Zostera pacifica L.
Eelgrass,
Seawrack,
Zostére marine
Native,
Vulnerable
Zostera.jpg
Zostera marina NY-dist-map.png
NYFA-3
USDA-NN

ITIS
FNA 


Images, wsp

Family Potamogetonaceae[edit]

The Potamogetonaceae (pond-weed family)

Genus Zannichellia[edit]

Potamogetonaceae – genus Zannichellia
Zannichellia Horned pondweed N.Y. Status Images Distribution 1
 L.

1753. Zannichellia palustris L.
Horned pondweed Native,
Secure
ZannichelliaPalustris3.jpg
Zannichellia palustris NY-dist-map.png
NYFA-5
USDA-NN
NEW Can
ITIS
FNA 


Images, wsp

Genus Potamogeton[edit]

The Potamogeton subdivisions used here are from Lindqvist et al. (2006).[1]

Potamogeton clade 1A[edit]

Alismatales – fam. Potamogetonaceae – genus Potamogetonclade 1A
Potamogetonclade 1A Pondweed N.Y. Status Images Distribution 32
 Oakes
Robbins' pondweed,
Flat-leaved pondweed,
Fern pondweed

Potamot de Robbins
Native,
Secure
Potamogeton robbinsii NRCS-002.jpgImg spacer 2x87.pngBB-0208 Potamogeton robbinsii.png
NYFA-5
USDA-NN
NEW 

FNA 


Images, wsp
 L.

1753. Potamogeton crispus  L.
Curly pondweed,
Curled pondweed

Potamot crepu
Introduced from
 Eurasia,
 northern Africa,
 Australia,
Very highly invasive,
NYIS: 80%[2],
NE-1[3] Note[4]
Potamogeton crispus1.jpg
Potamogeton crispus NY-dist-map.png
NYFA-X
USDA-XX
NEW 
ARS 
FNA 


Images, wsp
  1. Lindqvist, C., De Laet, J., Haynes, R. R., Aagesen, L., Keener, B. R. and Albert, V. A. (2006), Molecular phylogenetics of an aquatic plant lineage, Potamogetonaceae. Cladistics, 22: 568–588. doi: 10.1111/j.1096-0031.2006.00124.x
  2. New York non-native plant invasiveness assessmentPotamogeton crispus: Very high (80).
  3. Category 1 Plants - highly invasive - Eastern Region invasive plants, ranked by degree of invasiveness as based on information from States (1998) US Forest Service
  4. The exotic invasive Potamogeton crispus is easily recognized by being the only species in North America with serrate leaves (Flora of North America).

Potamogeton clade 1B[edit]

Alismatales – fam. Potamogetonaceae – genus Potamogetonclade 1B
Potamogetonclade 1B Pondweed N.Y. Status Images Distribution 32
Tuck. (1848)
Largeleaf pondweed,
Large-leaved pondweed,
Broad-leaved pondweed

Potamot à grandes feuilles
Native,
Secure
Potamogeton amplifolius NRCS-2.jpg
Potamogeton amplifolius NY-dist-map.png
NYFA-5
USDA-NN
NEW Can

FNA 


Images, wsp
 L.
Floating pondweed,
Floating-leaved pondweed
Native,
Secure
Potamogeton natans.jpg
NYFA-5
USDA-NN
NEW 




Images, wsp
 Poir.
Long-leaved pondweed Native,
Secure
Potamogeton nodosus.jpg
Potamogeton nodosus NY-dist-map.png
NYFA-5
USDA-NN
NEW 




Images, wsp
J.W.Robbins
Oakes' pondweed Native,
Secure
BB-0175 Potamogeton oakesianus.png
Potamogeton oakesianus NY-dist-map.png
NYFA-5
USDA-NN
NEW 




Images, wsp
 Wulfen
Whitestem pondweed,
White-stemmed pondweed

Potamot à longs pédoncules
Native,
Secure
Potamogeton praelongus bluete.jpeg
NYFA-5
USDA-NN
NEW 

FNA 


Images, wsp
(A.Benn.) Rydb.

1889. P. perfoliatus var. richardsonii A.Benn.
1905. Potamogeton richardsonii  Rydb.
1941. P. perfoliatus ssp. richardsonii Hultén
Richardson's pondweed Native,
Secure
Potamogeton richardsonii 02.jpg
NYFA-5
USDA-NN
NEW 

FNA 


Images, wsp
 L.
Grassy pondweed Native,
Secure
Potamogeton gramineus (3817604665).jpg
NYFA-5
USDA-NN
NEW 




Images, wsp
Illinois pondweed Native,
Secure
BB-0184 Potamogeton illinoensis.png
Potamogeton illinoensis NY-dist-map.png
NYFA-5
USDA-NN
NEW 




Images, wsp
 L.

1753. P. perfoliatus L.
Claspingleaf pondweed,
Clasping-leaved pondweed,
Clasped pondweed,
Perfoliate pondweed

Potamot perfolié
Native,
Secure
PotamogetonPerfoliatus.jpg
NYFA-5
USDA-NN
NEW 
ARS 
FNA 


Images, wsp
(J.W. Robbins) Morong (pro sp.)

Potamogeton gramineus ×
Potamogeton illinoensis
Hybrid pondweed Native,
Vulnerable
NYFA-3?
USDA-NN





Images, wsp

Potamogeton gramineus ×
Potamogeton perfoliatus
Hybrid pondweed Native,
Vulnerable
NYFA-3?
USDA-NN





Images, wsp
 Hagstr.

Potamogeton illinoensis ×
Potamogeton perfoliatus
Hybrid pondweed Native,
Unranked
NYFA-U
USDA-N0





Images, wsp
Balbis

1804. Potamogeton alpinus Balbis
Alpine pondweed,
Northern pondweed,
Red pondweed
Native,
Threatened
Potamogeton alpinus out of watet.jpg
NYFA-2
USDA-NN
NEW 




Images, wsp
 Tuck.
Spotted pondweed Native,
Threatened
BB-0177 Potamogeton pulcher.png
NYFA-2
USDA-NN
NEW 




Images, wsp

Potamogeton clade 2A[edit]

Alismatales – fam. Potamogetonaceae – genus Potamogetonclade 2A
Potamogetonclade 2A Pondweed N.Y. Status Images Distribution 32
 Raf.
Ribbon-leaved pondweed,
Nuttall's pondweed
Native,
Secure
Potamogeton epihydrus NRCS-1.jpg
NYFA-5
USDA-NN
NEW 




Images, wsp

Potamogeton clade 2B[edit]

Alismatales – fam. Potamogetonaceae – genus Potamogetonclade 2B
Potamogetonclade 2B Pondweed N.Y. Status Images Distribution 32
Fernald

1893. P. diversifolius var. trichophyllus
1932. P. bicupulatus  Fernald
Snailseed pondweed,
Snail-seeded pondweed
Native,
Secure
Potamogeton bicupulatus, NH, USA.jpg
Potamogeton bicupulatus NY-dist-map.png
NYFA-5
USDA-NN
NEW Can

FNA Trop.


Images, wsp
 Tuck.

1817. Potamogeton dimorphus Raf.
1848. Potamogeton spirillus Tuck.
Spiral pondweed,
Northern snailseed pondweed

Potamot spirille
Native,
Secure
Potamogeton spirillus (as Potamogeton dimorphus) BB-1913.png
Nymap.svg
NYFA-5
USDA-NN
NEW Can

FNA Trop.


Images, wsp
Rchb.

1845. Potamogeton confervoides Rchb.
     Potamogeton tuckermanii
Algae-like pondweed,
Alga pondweed,
Tuckerman’s pondweed

Potamot confervoïde
Native,
Threatened
BB-0190 Potamogeton confervoides.png
Potamogeton confervoides NY-dist-map.png
NYFA-3
USDA-NN
NEW Can




Images, wsp
Raf. (1808)

     P. capillaceus Poir.
     P. dimorphus Raf.
Water-thread pondweed Native,
Endangered
Potamogeton diversifolius NRCS-1.jpg
NYFA-1
USDA-N0
NEW 

FNA 


Images, wsp

Potamogeton clade 2C[edit]

Alismatales – fam. Potamogetonaceae – genus Potamogetonclade 2C
Potamogetonclade 2C Pondweed N.Y. Status Images Distribution 32
 Raf.
ssp. foliosus
Leafy pondweed Native,
Secure
Potamogeton foliosus NRCS-1.jpg
NYFA-5
USDA-NN
NEW 




Images, wsp
 L.
ssp. pusillus
Small pondweed Native,
Secure
BB-0200 Potamogeton pusillus.png
NYFA-5
USDA-NN
NEW 




Images, wsp
 L.
ssp. tenuissimus
(Mert. & W.D.J.Koch)
Haynes & C.B.Hellquist
Small pondweed Native,
Secure
PotamogetonPusillusAgg.jpg
NYFA-5
NEW 




Images, wsp
 J.W.Robbins

1867. Potamogeton vaseyi J.W.Robbins
Vasey's pondweed Native,
Secure
BB-0198 Potamogeton vaseyi.png
NYFA-5
USDA-NN
NEW 

FNA 


Images, wsp
Fernald
Flat-stemmed pondweed Native,
Secure
Potamogeton zosteriformis NRCS-1.jpg
NYFA-5
USDA-NN
NEW 




Images, wsp
Fries' pondweed Native,
Likely secure
BB-0196 Potamogeton friesii.pngImg spacer 2x87.pngPotamogeton friesii.jpeg
NYFA-4?
USDA-NN
NEW 




Images, wsp
Mert. & W.D.J. Koch
Blunt-leaved pondweed Native,
Likely secure
Potamogeton obtusifolius kz1.JPG
NYFA-4
USDA-NN
NEW 




Images, wsp
 Morong
Hill's pondweed Native,
Threatened
BB-0193 Potamogeton hillii.png
NYFA-2
USDA-NN
NEW 




Images, wsp
Hellquist & Hilton
Ogden's pondweed Native,
Endangered
NYFA-1
USDA-NN
NEW 




Images, wsp
 Benn.
Straight-leaved pondweed,
Narrowleaf pondweed
Native,
Endangered
NYFA-1
USDA-NN
NEW 




Images, wsp
Hellquist & Crow

Potamogeton strictifolius ×
Potamogeton zosteriformis
Hybrid pondweed Native,
Endangered
NYFA-1?
USDA-NN





Images, wsp

Genus Stuckenia[edit]

Alismatales – fam. Potamogetonaceae – genus Stuckenia
Stuckenia Pondweed N.Y. Status Images Distribution 3
 (Pers.) Börner
ssp. alpinus
Fineleaf pondweed Native,
Endangered
YOSE219561 Stukenia filiformis ssp. alpinus.jpg
Nymap.svg
NYFA-1
USDA-NN





Images, wsp
 (Pers.) Börner
ssp. occidentalis

Potamogeton interior Rydb.
Sheathed pondweed,
Western fineleaf pondweed
Native,
Endangered
Stuckenia filiformis ssp occidentalis BB-1913.png
Nymap.svg
NYFA-1
USDA-NN





Images, wsp
 (L.) Börner
Sago pondweed Native,
Secure
PotamogetonPectinatus1.jpg
Nymap.svg
NYFA-5
USDA-NN





Images, wsp