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 AcoralesEdit

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

Family AcoraceaeEdit

Genus AcorusEdit

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)

OBL

Perennial,
Herb-forb,
Sun
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)

OBL

Perennial,
Herb-forb,
Sun
NYFA-X
USDA-X
NEW Can
ARS ITIS
FNA Trop.
NSE BNA


Images, wsp

Order AlismatalesEdit

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

Family AraceaeEdit

The Araceae (arum family)...

Subfamily OrontioideaeEdit

Tribe OrontieaeEdit

Genus OrontiumEdit
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]

OBL

Perennial,
Herb-forb,
Part shade
NYFA-2
USDA-N0

ARS 
Trop.

LBJ

Images, wsp

Tribe SymplocarpeaeEdit

Genus SymplocarpusEdit
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

OBL

Perennial,
Herb-forb,
Shade
NYFA-5
USDA-NN

ARS 
FNA Trop.

LBJ

Images, wsp

Subfamily LemnoideaeEdit

Genus SpirodelaEdit

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

OBL

Perennial,
Herb-forb
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 LemnaEdit

Alismatales – fam. Araceae – subfam. Lemnoideae – genus Lemna
Lemna Duckweed N.Y. Status Images Distribution 5
 L.

    L. cyclostasa Ell. ex Schleid.
    L. minima Chev. ex Schleid.
Lesser duckweed Native, CoC: 2,
Secure
NYFA-5
USDA-NN






Images, wsp
 L.

Star duckweed Native, CoC: 4,
Secure
NYFA-5
USDA-NN






Images, wsp
 Torr.

Minute duckweed Native, CoC: 4,
Endangered,
NYNHP: 1[1]
NYFA-1
USDA-NN






Images, wsp
 Phil.

Pale duckweed,
Valdivia duckweed
Native, CoC: 10,
Endangered,
NYNHP: 1[2]
NYFA-1
USDA-NN






Images, wsp
 Landolt

Turion duckweed,
Lenticulare turionifère
Native, CoC: 4,
Unranked

OBL
NYFA-U
USDA-NN

ITIS




Images, wsp
Lemna (excluded species) Duckweed N.Y. Status Images Distribution X
L.

    Lemna gibba L.
    
    
Swollen duckweed N. America native,
Excluded
NYFA-EXCLD
USDA-N0






Images, wsp
 (Austin) Daubs

    L. minor var. obscura
    
    
Little duckweed N. America native,
Excluded
NYFA-EXCLD
USDA-N0

ARS 




Images, wsp

Genus WolffiaEdit

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
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, …
 auctWolffia punctata
Dotted watermeal,
Northern watermeal,
Northern duckmeal

Wolffie borèle
Native,
Likely secure
NYFA-4
USDA-NN
NEW 
ARS ITIS
FNA Trop.



Images, wsp
 Wedd.

    Bruniera punctata
    Wolffia punctata Griseb.
    Wolffia papulifera
Brazilian watermeal Native,
Likely secure
NYFA-4
USDA-N0
NEW 
ARS ITIS
FNA 



Images, wsp

Subfamily AroideaeEdit

Tribe CalleaeEdit

Genus CallaEdit
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

OBL

Perennial,
Herb-forb
NYFA-5
USDA-NN
NEW Can
ARS ITIS
FNA 



Images, wsp

Tribe PeltandreaeEdit

Genus PeltandraEdit
Alismatales – fam. Araceae – subfam. Aroideae – tribe Peltandreae
Peltandra Arrow-arum N.Y. Status Images Distribution 1

Green arrow-arum,
Tuckahoe
Native,
Secure
NYFA-5
USDA-NN






Images, wsp

Tribe ArisaemateaeEdit

Genus ArisaemaEdit
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
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
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
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
NYFA-4
USDA-NN
NEW Can
ARS 
FNA Trop.



Images, wsp
Genus PinelliaEdit
Alismatales – fam. Araceae – subfam. Aroideae – tribe Arisaemateae – genus Pinellia
Pinellia Pinellia N.Y. Status Images Distribution 1

Crowdipper,
Green dragon
Introduced NYFA-X






Images, wsp

Tribe PistieaeEdit

Genus AraceaeEdit
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
Engl.
Water-lettuce,
Tropical duckweed,
Nile cabbage

Laitue d'eau
Introduced from
 US South,
 South America,
 Africa,
Potentially invasive,
NYIS: 62%[1],
Impersistent
NYFA-X
USDA-N0
Can
ARS ITIS
Trop.



Images, wsp

Family TofieldiaceaeEdit

Genus TrianthaEdit

Alismatales – fam. Tofieldiaceae
Triantha Tofieldia N.Y. Status Images Distribution 1
 (Michx.) Baker

Sticky false-asphodel Native,
Endangered
NYFA-1
USDA-NN






Images, wsp

Family AlismataceaeEdit

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

Genus SagittariaEdit

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

OBL

Perennial,
Herb-forb
NYFA-5
USDA-N






Images, wsp

Sessile-fruited arrowhead Native, CoC: 6,
Secure

OBL

Perennial,
Herb-forb
NYFA-5
USDA-N






Images, wsp
ssp. graminea

Grass-leaved arrowhead Native, CoC: 8,
Secure

OBL

Perennial,
Herb-forb
NYFA-5
USDA-N






Images, wsp

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

OBL

Perennial,
Herb-forb
NYFA-5
USDA-NN






Images, wsp

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

OBL

Perennial,
Herb-forb
NYFA-4
USDA-N






Images, wsp

Strap-leaved arrowhead Native, CoC: 7,
Rare

OBL

Perennial,
Herb-forb
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

OBL

Annual,
Herb-forb
NYFA-2
USDA-N


FNA 



Images, wsp

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

OBL

Perennial,
Herb-forb
NYFA-1
USDA-N


FNA 



Images, wsp
Sagittaria (excluded species) Arrowhead N.Y. Status Images Distribution 8
(J.G.Sm.) Small

1897. S. longirostra var. australis
1903. S. australis (J.G.Sm.) Small
 auct. S. engelmanniana ssp. longirostra
 auct. S. longirostranon J.G.Sm.
Longbeak arrowhead,
Appalachian arrowhead
N. America native,
Excluded
NYFA-EXCLD
USDA-N

ARS 
FNA Trop.



Images, wsp

Genus AlismaEdit

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

OBL

Perennial,
Herb-forb
NYFA-5
USDA-N
NEW 





Images, wsp

    
    
    
Northern water-plantain Native, CoC: 4,
Secure

OBL

Perennial,
Herb-forb
NYFA-5
USDA-N
NEW 





Images, wsp
Lej.

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

OBL

Perennial,
Herb-forb
NYFA-2-3
USDA-N
NEW 





Images, wsp

Genus HelanthiumEdit

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
NYFA-Z
USDA-NN
NEW 
ARS ITIS
FNA Trop.



Images, wsp

Family ButomaceaeEdit

 
Butomus umbellatus

Genus ButomusEdit

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]
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 HydrocharitaceaeEdit

The Hydrocharitaceae (tape-grass family) ...

Subfamily HydrocharitoideaeEdit

Genus HydrocharisEdit

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]
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 EgeriaEdit

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]
NYFA-X
USDA-XW
NEW Can
ARS ITIS
FNA Trop.



Images, wsp

Genus LimnobiumEdit

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
NYFA-X
USDA-N0

ARS ITIS
FNA Trop.



Images, wsp

Subfamily StratiotoideaeEdit

Genus StratiotesEdit

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]

USDA-00
Can
ARS ITIS
Trop.
BNA


Images, wsp
Note: CA

Subfamily AnacharidoideaeEdit

Genus ElodeaEdit

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
NYFA-5
USDA-NN






Images, wsp
(Planch.) St. John

Nuttall's waterweed Native,
Secure
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
NYFA-X
USDA-NN






Images, wsp

Subfamily NajadoideaeEdit

Tribe NajadeaeEdit

Genus NajasEdit
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
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
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
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]
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
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
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]
NYFA-X
USDA-XX
NEW 
ARS 
FNA Trop.



Images, wsp
Genus HydrillaEdit
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]
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 VallisnerieaeEdit

Genus VallisneriaEdit
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
NYFA-5
USDA-NN






Images, wsp

Family ScheuchzeriaceaeEdit

The monotypic Scheuchzeriaceae (scheuchzeria family)

Genus ScheuchzeriaEdit

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
NYFA-3
USDA-NN






Images, wsp

Family JuncaginaceaeEdit

The Juncaginaceae (arrowgrass family)

Genus TriglochinEdit

Alismatales – fam. Juncaginaceae – genus Triglochin
Triglochin Arrowgrass N.Y. Status Images Distribution 2
 L.

Seaside arrowgrass Native,
Likely secure
NYFA-4
USDA-NN






Images, wsp
 L.

Slender bog arrow-grass Native,
Threatened
NYFA-2
USDA-NN






Images, wsp

Family RuppiaceaeEdit

The Ruppiaceae (ditch-grass family)

Genus RuppiaEdit

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

OBL

Perennial,
Herb-forb
NYFA-3-4
USDA-NN
NEW Can
ITIS
FNA Trop.
NSE BNA


Images, wsp

Family ZosteraceaeEdit

The Zosteraceae (eelgrass family)

Genus ZosteraEdit

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

Zostera pacifica L.
Eelgrass,
Seawrack,
Zostére marine
Native,
Vulnerable
NYFA-3
USDA-NN

ITIS
FNA 



Images, wsp

Family PotamogetonaceaeEdit

The Potamogetonaceae (pond-weed family)

Genus ZannichelliaEdit

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

1753. Zannichellia palustris L.
Horned pondweed Native,
Secure
NYFA-5
USDA-NN
NEW Can
ITIS
FNA 



Images, wsp

Genus PotamogetonEdit

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

Potamogeton clade 1AEdit

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
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]
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 1BEdit

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
NYFA-5
USDA-NN
NEW Can

FNA 



Images, wsp
 L.

    
    
    
Floating pondweed,
Floating-leaved pondweed
Native,
Secure
NYFA-5
USDA-NN
NEW 





Images, wsp
 Poir.

    
    
    
Long-leaved pondweed Native,
Secure
NYFA-5
USDA-NN
NEW 





Images, wsp
J.W.Robbins

    
    
    
Oakes' pondweed Native,
Secure
NYFA-5
USDA-NN
NEW 





Images, wsp
 Wulfen

    
    
    
Whitestem pondweed,
White-stemmed pondweed

Potamot à longs pédoncules
Native,
Secure
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
NYFA-5
USDA-NN
NEW 

FNA 



Images, wsp
 L.

    
    
    
Grassy pondweed Native,
Secure
NYFA-5
USDA-NN
NEW 





Images, wsp

    
    
    
Illinois pondweed Native,
Secure
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
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

    
    
    
Alpine pondweed,
Northern pondweed,
Red pondweed
Native,
Threatened
NYFA-2
USDA-NN
NEW 





Images, wsp
 Tuck.

    
    
    
Spotted pondweed Native,
Threatened
NYFA-2
USDA-NN
NEW 





Images, wsp
Potamogetonclade 1B (excluded species) Pondweed N.Y. Status Images Distribution X

    
    
    
Shining pondweed Introduced from
 Eurasia,
 northern Africa,
Excluded
NYFA-EXCLD






Images, wsp

Potamogeton gramineus ×
Potamogeton lucens

    
    
    
Long-leaved pondweed Introduced from
 Eurasia,
 northern Africa,
Excluded
NYFA-EXCLD






Images, wsp

Potamogeton clade 2AEdit

Alismatales – fam. Potamogetonaceae – genus Potamogetonclade 2A
Potamogetonclade 2A Pondweed N.Y. Status Images Distribution 32
 Raf.

Ribbon-leaved pondweed,
Nuttall's pondweed
Native,
Secure
NYFA-5
USDA-NN
NEW 





Images, wsp

Potamogeton clade 2BEdit

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
NYFA-5
USDA-NN
NEW Can

FNA Trop.



Images, wsp
 Tuck.

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

Potamot spirille
Native,
Secure
NYFA-5
USDA-NN
NEW Can

FNA Trop.



Images, wsp
Rchb.

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

Potamot confervoïde
Native,
Threatened
NYFA-3
USDA-NN
NEW Can





Images, wsp
Raf. (1808)

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

FNA 



Images, wsp

Potamogeton clade 2CEdit

Alismatales – fam. Potamogetonaceae – genus Potamogetonclade 2C
Potamogetonclade 2C Pondweed N.Y. Status Images Distribution 32
 Raf.
ssp. foliosus

    
    
    
Leafy pondweed Native,
Secure
NYFA-5
USDA-NN
NEW 





Images, wsp
 L.
ssp. pusillus

    
    
    
Small pondweed Native,
Secure
NYFA-5
USDA-NN
NEW 





Images, wsp
 L.
ssp. tenuissimus
(Mert. & W.D.J.Koch)
Haynes & C.B.Hellquist

    
    
    
Small pondweed Native,
Secure
NYFA-5
NEW 





Images, wsp
 J.W.Robbins

    
    
    
Vasey's pondweed Native,
Secure
NYFA-5
USDA-NN
NEW 

FNA 



Images, wsp
Fernald

    
    
 auct. P. compressusnon L.
Flat-stemmed pondweed,
Flatstem pondweed
Native,
Secure
NYFA-5
USDA-NN
NEW 





Images, wsp

    
    
    
Fries' pondweed Native,
Likely secure
NYFA-4?
USDA-NN
NEW 





Images, wsp
Mert. & W.D.J. Koch

    
    
    
Blunt-leaved pondweed Native,
Likely secure
NYFA-4
USDA-NN
NEW 





Images, wsp
 Morong

    
    
    
Hill's pondweed Native,
Threatened
NYFA-2
USDA-NN
NEW 





Images, wsp
Hellquist & Hilton

    
    
    
Ogden's pondweed Native,
Endangered
NYFA-1
USDA-NN
NEW 





Images, wsp
 Benn.

    
    
 auct. P. rutilusnon Wolfg.
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
Potamogetonclade 2C (excluded species) Pondweed N.Y. Status Images Distribution X

1753. P. compressus L.
    
Grass-wrack pondweed,
Flatstem pondweed,
Eelgrass pondweed
Introduced from
 Eurasia,
Excluded
NYFA-EXCLD





Kew 
Images, wsp
Wolfg.

1827. P. rutilus Wolfg.
    
Shetland pondweed Introduced from
 Eurasia,
Excluded
NYFA-EXCLD





Kew 
Images, wsp

Genus StuckeniaEdit

Alismatales – fam. Potamogetonaceae – genus Stuckenia
Stuckenia Pondweed N.Y. Status Images Distribution 2
 (L.) Börner

    Potamogeton pectinatus L.
    Stuckenia pectinata (L.) Börner
    Coleogeton pectinatum
(L.) Les & R.R.Haynes
Sago pondweed Native, CoC: 2,
Secure
NYFA-5
USDA-NN






Images, wsp
(Pers.) Börner

    
    
    
Thread-leaved pondweed,
Fineleaf pondweed
Native,
Endangered
NYFA-1
USDA-NN






Images, wsp
Stuckenia (excluded species) Pondweed N.Y. Status Images Distribution X
(Turcz.) Holub

1854. Potamogeton vaginatus Turcz.
1984. Stuckenia vaginata
(Turcz.) Holub
    
Sheathed pondweed,
Big sheathed pondweed,
Large sheathed pondweed

Potamot engainé
N. America native,
Endangered
NYFA-EXCLD
USDA-NN


FNA 



Images, wsp

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