Connecticut State The Connecticut Agricultural Experiment Station

Online Herbarium

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Scientific Name vs. Common Name

[A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Y] [Z]

*Invasive Species 
A

Acadian quillwort (Isoetes acadiensis)
Isoetes acadiensis, Alexander Lake in Killingly, July 27, 2011
Alternate-flowered watermilfoil (Myriophyllum alterniflorum)
Myriophyllum alterniflorum, West Side Pond in Goshen, August 29, 2012
American bur-reed (Sparganium americanum)
Sparganium americanum, Bissonnette Pond in Willington, August 28, 2006
American featherfoil (Hottonia inflata)
Hotonia inflata, Hummers Pond in Madison, May 26, 2017
American lotus (Nelumbo lutea)*
Nelumbo lutea, Putnam Park in Eastin, September 26, 2011
American water pennywort (Hydrocotyle americana)
Hydrocotyle americana, in cultivation at Exotic Fin and Feather Pet Shop in East Hartford, December 9, 2010
American water plantain (Alisma subcordatum)

American waterwort (Elatine americana)
Elatine americana Beaver Dam Lake in Stratford July 22, 2009
American white water lily (Nymphaea odorata ssp. tuberosa)
Nymphaea odorata ssp. tuberosa in Longmeadow Lake, Bethlehem, July 5. 2005
Arrowhead (Sagittaria species)
Sagittaria species, Connecticut River in Haddam, September 25, 2019
Arumleaf arrowhead (Sagittaria cuneata)
Sagittaria cuneata, Lake Zoar in Southbury, Monroe, Newtown, and Oxford, August 29, 2007

B

Bayonet rush (Juncus militaris)
Juncus militaris, Middle Quaddick Reservoir in Thompson, September 6, 2017
Berchtold's pondweed (Potamogeton berchtoldii)
Potamogeton berchtoldii, Bashan Lake in East Haddam, July 10, 2019
Bittercress (Cardamine species)
Cardamine species, Crystal Pond, July 14, 2009
Bladderwort species Bluntleaf pondweed Brazilian watermeal Utricularia species Potamogeton obtusifolius Wolffia brasiliensis Utricularia species, Lake Hayward in East Haddam, July 24, 2019 Potamogeton obtusifolius, Hart Pond in Litchfield, September 27, 2013 Wolffia brasiliensis, Mackenzie Reservoir in Wallingford, June 30, 2005 Brazilian waterweed* Brittle waternymph* Broadleaf arrowhead Egeria densa Najas minor Sagittaria latifolia Egeria densa, Dogwood Lake in Trumbull, September 29, 2020 Najas Minor in Lake Lillinonah in Newtown, July 10, 2007 Sagittaria latifolia, Bassermann Pond in Branford, June 25, 2009 Brown-fruited rush Bulrush Bur-reed Juncus pelocarpus Schoenoplectus species Sparganium species Juncus pelocarpus, Billings Lake in North Stonington, September 21, 2005 Schoenoplectus species, Indian Lake in Sharon, June 29, 2009 Sparganium species, Dogwood Lake in Trumbull, September 29, 2020

C

Canadian waterweed Clasping-leaf pondweed Common bladderwort
Elodea canadensis Potamogeton perfoliatus Utricularia macrorhiza (vulgaris)
Elodea canadensis, Indian Lake in Sharon, June 29, 2009  Potamogeton perfoliatus, Lake Beseck in Middlefield, June 22, 2004 Utricularia macrorhiza, Chalkers Mill Pond in Old Saybrook, July 22, 2005
Common duckweed Common water hyacinth* Coontail
Lemna minor Eichhornia crassipes Ceratophyllum demersum
Lemna Minor, Twin Lake North in Simsbury, September 11, 2018  Eichhornia crassipes Mill Pond Park in Newington, September 4, 2009 Ceratophyllym demersum, Coventry Lake, July 09, 2008
Curlyleaf pondweed* Cutleaf watermilfoil
Potamogeton crispus Myriophyllum pinnatum
Potamogeton crispus, Taunton Lake in Newtown, June 15 2010  Myriophyllum pinnatum, in cultivation at Slither & Swim Pets in West Haven December 14, 2010

D

Dortmann's cardinalflower Dwarf spikerush
Lobelia dortmanna Eleocharis parvula
Lobelia dortmanna, Cedar Lake in Chester, September 5, 2010  Eleocharis parvula, Canoe Brook Lake in Trumbull, August 18, 2004

E

Eaton's quillwort Eelgrass Elliptic spikerush
Isoetes x eatonii Vallisneria americana Eleocharis elliptica
Isoëtes X eatonii, Hall's Pond in Eastford, August 1, 2005  Vallisneria americana, Uncas Lake in Lyme, July 8, 2015 Eleocharis elliptica, Oakwood Pond in Guilford, July 14, 2006
Engelmann's arrowhead Engelmann's quillwort Eurasian watermilfoil*
Sagittaria engelmanniana Isoetes engelmannii Myriophyllum spicatum
Sagittaria engelmanniana, Connecticut River in Middletown, August 18, 2020  Isoëtes engelmanii, Hidden Lake in Haddam, July 11, 2005 Myriophyllum spicatum, Candlewood Lake in Danbury, August 27, 2015
European waterclover*
Marsilea quadrifolia
Marsilea quadrifolia, Bunnells Pond in Bridgeport, June 30 2011

F

Fanwort*   Flat-leaf bladderwort Flat-stemmed pondweed
Cabomba caroliniana Utricularia intermedia Potamogeton zosteriformis
Fanwort, Anderson Pond, August 23, 2012  Utricularia intermedia, Staffordville Reservoir in Stafford Springs, September 4, 2019 Potamogeton zosteriformis, Lake Zoar in Southbury, September 3, 2015
Floating bladderwort Floating heart Floating-leaf pondweed
Utricularia radiata Nymphoides species Potamogeton natans
Utricularia radiata, Private pond in Clinton, August 13, 2013  Nymphoides species in Doaneville Pond, Griswold, July 6, 2011 Potamogeton natans, Staffordville Reservoir in Staffordville Springs, September 4, 2019
Forget-me-not* Fries' pondweed
Myosotis scorpioides Potamogeton friesii
Myosotis scorpioides, Crystal Lake in Middletown, August 25, 2009  Potamogeton friesii, Lake Wononscopomuc in Salisbury, September 16, 2004

G

Golden hedge-hyssop Grassy arrowhead Great bulrush Gratiola aurea Sagittaria graminea Schoenoplectus tabernaemontani Gratiola aurea, Amos Lake in Preston, August 15, 2013 Sagittaria graminea, Lake Lillinonah in Newtown, July 27, 2007 Schoenoplectus tabernaemontani, Town Mill Pond in Guilford, July 30, 2009 Great duckweed Great water starwort Green arrow arum Spirodela polyrhiza Callitriche heterophylla Peltandra virginica Spirodela polyrhiza, Phipps Lake in West Haven, June 6, 2018 Callitriche heterophylla, Red Wing Pond, July 13, 2009 Peltandra virginica, Roseland Lake in Woodstock, June 18, 2012

H

Hiddenfruit bladderwort Horned pondweed Humped bladderwort
Utricularia geminiscapa Zannichellia palustris Utricularia gibba
Utricularia geminiscapa, West Lake in Guilford, August 2, 2010  Zannichellia palistris, Connecticut River, Lyme, September 28, 2019 Utricularia gibba, Gorton Pond in East Lyme, July 9, 2015
Hydrilla*
Hydrilla verticillata
Hydrilla verticillata, Connecticut River, Haddam, October 1, 2018

I

Illinois pondweed Illinois pondweed hybrid
Potamogeton illinoensis Potamogeton praelongus x illinoensis
Potamogeton illinoensis, Indian Lake in Sharon, June 30, 2009  Potamogeton praelongus x illinoensis, Tyler Lake in Goshen, August 14, 2011

K
Knotweed
Polygonum species
Polygonum species, East Haddam, Connecticut River, August 18, 2020
L

Lake ludwigia Large-leaf pondweed Leafy pondweed
Ludwigia x lacustris Potamogeton amplifolius Potamogeton foliosus
Ludwigia X lacustris, West Lake in Guilford, August 2, 2010  Potamogeton amplifolius, Pistapaug Pond in Wallingford June 29, 2005 Potamogeton foliosus, Bethmour Road Pond in Bethany, September 9, 2009
Lesser bladderwort Little floating heart Long-leaf pondweed
Utricularia minor Nymphoides cordata Potamogeton nodosus
Utricularia minor, Uncas Lake in Lyme, July 7, 2015   Nymphoides cordata in Messerschmidt Pond, Deep River/Westbrook, August 16, 2005 Potamogeton nodosus, Lake Zoar in Monroe, Newtown, Oxford, and Southbury, September 2, 2008
Long-leaf pondweed hybrid Longstem waterwort Low watermilfoil
Potamogeton gramineus x nodosus Elatine triandra Myriophyllum humile
Potamogeton gramineus x nodosus, Lake Housatonic in Shelton, July 19, 2017 Elatine triandra, Candlewood Lake in Brookfield, Danbury, New Fairfield, New Milford, and Sherman, September 12, 2008  Myriophyllum humile Black Pond in Middlefield/Meriden, July 5, 2011

M

Marsh bedstraw Marsh mermaid weed Marsh primrose-willow
Galium palustre Proserpinaca palustris Ludwigia palustris
Galium palustre, Private Pond in Stonington, May 18, 2017  Proserpinaca palustris, Staffordville Reservoir in Stafford Springs, September 5, 2019 Ludwigia palustris, Deer Lake Reservoir in Killingworth September 14, 2009
Marshweed Mayaca Mosquitofern
Limnophila species  Mayaca species Azolla species
Herbarium mount of Limnophila species plant found in pet store Mayaca species, in cultivation at Puppy Center and Aquarium in West Hartford, September 10, 2009 Mosquitofern, Private Pond West, Suffield, September 4, 2012
Mudmat
Glossostigma cleistanthum
Glossostigma cleistanthum, Bashan Lake in East Haddam, October 5, 2016

N

Nardoo Narrowleaf anacharis Narrow-leaved arrowhead
Marsilea drummondii Egeria najas Sagittaria filiformis
Marsilea drummondii, in cultivation at All Pets Club in Branford December 16, 2010  Egeria najas in Branford, August 21, 2009 Sagittaria filiformis, Connecticut River in Enfield, August 19, 2020
Needle spikerush Northern watermilfoil
Eleocharis acicularis Myriophyllum sibiricum
Eleocharis acicularis, Lake Lillinonah in Newtown, August 11, 2011  Myriophyllum sibiricum, Black Pond in Middlefield, June 25, 2004

O

Oakes' pondweed One-rowed watercress
Potamogeton oakesianus Rorippa microphylla
Potamogeton oakesianus, Ball Pond in New Fairfield August 17, 2005  Rorippa microphylla, Private Pond in New Haven, May 14, 2010

P

Parrotfeather* Phragmites* Pickerelweed
Myriophyllum aquaticum Phragmites australis Pontederia cordata
Myriophyllum aquaticum, Dogwood Lake in Trumbull September 29, 2020  Phragmites australis, Andover Lake in Andover, August 11, 2008 Pontederia cordata, Middle Bolton Lake in Vernon, July 14, 2020
Pond water starwort Pondweed Primrose-willow Callitriche stagnalis Potamogeton species Ludwigia species Callitriche stagnalis, Red Wing Pond, July 13, 2009 Potamogeton species, Connecticut River, Enfield, August 19, 2020 Ludwigia species, Eagleville Lake in Coventry, September 21, 2012 Purple bladderwort Utricularia purpurea Utricularia purpurea, Lower Moodus Reservoir in East Haddam, July 7, 2009

Q

Quillwort
Isoetes species
Isoetes species, Lake Quassapaug in Middlebury, July 20, 2011

R

Ribbon-leaf pondweed Richardson's pondweed Robbins' pondweed
Potamogeton epihydrus Potamogeton richardsonii Potamogeton robbinsii
Potamogeton epihydrus, Private Pond in Clinton, August 13, 2013  Potamogeton richardsonii, Indian Lake in Sharon, June 29, 2009 Potamogeton robbinsii, Amos Lake in Preston, August 24, 2018
Rush
Juncus species
Juncus species, Lake Winchester in Winchester, September 20, 2007

S

Sago pondweed Sevenangle pipewort Shining pondweed
Stuckenia pectinatus Eriocaulon aquaticum Potamogeton x nitens
Stuckenia pectinata, Candlewood Lake in Brookfield September 3, 2016  Eriocaulon aquaticum, Lake Hayward in East Haddam, August 22, 2013 Herbarium mount of Potamogeton x nitens, or shining pondweed
Slender naiad Slender watermilfoil Small-leaved pond lily
Najas flexilis Myriophyllum tenellum Nuphar microphylla
Najas flexilis, Gorton Pond in East Lyme, July 9, 2015  Myriophyllum tenellum, Lake Hayward in East Haddam, July 24, 2019 Nuphar microphylla, Pachaug Pond in Griswold, September 10, 2017
Small pondweed Small pondweed hybrid Small waterwort
Potamogeton pusillus Potamogeton pusillus ssp. gemmiparus Elatine minima
Potamogeton pusillus, Lake Housatonic in Shleton, July 21, 2017  Potamogeton pusillus ssp gemmiparus, Beseck Lake in Middlefield, June 20, 2017      Elatine minima, Lower Moodus Reservoir in East Haddam July 08, 2009
Snailseed pondweed Southern naiad Spikerush
Potamogeton bicupulatus Najas guadalupensis Eleocharis species
Potamogeton bicupulatus, Crystal Lake in Middletown, September 3, 2008 Najas guadalupensis Black Pond in Woodstock, July 25, 2005  Eleocharis species, Fence Rock Lake in Guilford, August 3, 2017
Spineless hornwort Spiny-spored quillwort Spiral pondweed
Ceratophyllum echinatum Isoetes echinospora Potamogeton spirillus
Ceratophyllum echinatum, Upper Moodus Reservoir, July 14, 2016  Isoetes echinospora, Lake Chaffee in Ashford, July20, 2009  Potamogeton spirillus, Tyler Lake in Goshen, August 30, 2013
Spotted pondweed Star duckweed Swamp loosestrife
Potamogeton pulcher Lemna trisulca Decodon verticillatus
Potamogeton Pulcher, Young Pond in Branford, July 1, 2009 Lemna trisulca, Quonnipaug Lake in Guilford, July 8, 2010   Decodon verticillatus, Bushy Pond, June 05, 2019 Swamp smartweed Swollen bladderwort*
Polygonum hydropiperoides Utricularia inflata
 Swollen bladderwort mount from Bashan Lake

T

Thread-leaf naiad Tuckerman's pondweed Tuckerman's quillwort
Najas gracillima Potamogeton confervoides Isoetes tuckermannii
Najas gracillima, Beseck Lake in Middlefield, June 27, 2011  Potamogeton confervoides, Green Falls Reservoir in Voluntown, August 2, 2005 Isoetes tuckermanii, Black Hall Pond in Old Lyme, August 18, 2005

U

Unidentified species
Unidentified species, Buckley Pond in Union, July 23, 2020

V

Variable-leaf watermilfoil* Variable pondweed Variable watermilfoil hybrid*
Myriophyllum heterophyllum Potamogeton gramineus Myriophyllum heterophyllum x laxum
Myriophyllum heterophyllum, Anderson Pond in North Stonington, August 24, 2012  Potamogeton gramineus, Gardner Lake in Bozrah July 15, 2015 Myriophyllum heterophyllum x M. laxum, Anderson Pond in North Stonington New London, August 12, 2004
Vasey's pondweed Vernal water starwort
Potamogeton vaseyi Callitriche verna
Potamogeton vaseyi, Bashan Lake in East Haddam, July 10, 2019  Callitriche verna, Lake Lillinonah, July 27, 2007

W

Water chestnut* Water hyssop Water marigold
Trapa natans Bacopa species Megalodonta beckii
Trapa natans, Private Pond in Berlin, August 21, 2015  Water Hyssop, All Pets Club, August 27, 2009 Myriophyllum spicatum, Black Pond in Meriden, June 18, 2015
Watermilfoil Water pennywort Water Plantain
Myriophyllum species Hydrocotyle species Alisma species  
Myriophyllum species, in cultivation at All Pets Club in Wallingford, August 28, 2009  Hydrocotyle species, Private Pond in New Haven, May 14, 2010 Water plantain, Beseck Lake, June 26, 2017
Water smartweed Water spangles Water starwort
Polygonum amphibium Salvinia minima Callitriche species 
Polygonum amphibium, Silver Lake in Berlin/Meriden, July 2, 2008  Salvinia minima, in cultivation at Petsmart in Waterbury, September 10, 2009 Callitriche species, Bushy Pond, June 05, 2019
Watershield Water stargrass Waterwort
Brasenia schreberi Zosterella dubia Elatine species
Watershield, Brasenia schreberi  Zosterella dubia, Lake Zoar in Newtown, September 6, 2013 Elatine species, Fence Rock Lake in Guilford, August 3, 2017
Western waterweed White stem pondweed White stem pondweed hybrid
Elodea nuttallii Potamogeton praelongus Potamogeton gramineus x praelongus
Elodea nuttalii, Crystal Lake in Middletown, September 2, 2008  Potamogeton praelongus, Mudge Pond in Sharon, September 17, 2015 Potamogeton gramineus x praelongus Lake Zoar in Newtown, August 30 2017
White water crowfoot White water lily
Ranunculus longirostris Nymphaea odorata
Ranunculus longirostris, Mudge Pond in Sharon, September 22, 2015 Nymphaea odorata, Alexander Lake in Killingly, July 14, 2005

Y

Yellow floating heart*   Yellowseed false pimpernel Yellow water lily
Nymphoides peltata Lindernia dubia Nuphar variegata
  Lindernia dubia, Crystal Lake in Middletown, September 1, 2009 Nuphar variegata, Middle Bolton Lake in Vernon, July 14, 2020