Scientific Name Common Name Alisma sp. water plantain Alisma subcordatum American water plantain Azolla sp. mosquitofern Brasenia schreberi watershield Cabomba caroliniana fanwort twoheaded water-starwort, great water Callitriche heterophylla starwort Callitriche sp. water starwort Callitriche verna vernal water starwort Ceratophyllum demersum coontail, horwort Ceratophyllum echinatum spineless hornwort Macroalgae from the family Characeae charaphyte(s) (Nitella , Chara ) Sedges from the family Cyperaceae sedge(s) (Cyperus , Carex ) Decodon verticillatus swamp loosestrife Brazilian elodea, Brazilian waterweed, Egeria densa common waterweed, South American waterweed Eichhornia crassipes common water hyacinth Elatine americana American waterwort Elatine minima small waterwort Elatine sp. waterwort Elatine triandra longstem waterwort Eleocharis acicularis needle spikerush Eleocharis elliptica elliptic spikerush Eleocharis sp. spikerush Elocharis parvula dwarf spikerush Elodea canadensis Canadian waterweed, broad waterweed Elodea nuttallii western waterweed Eriocaulon aquaticum sevenangle pipewort Glossostigma cleistanthum mudmat, small-flower mud-mat Gratiola aurea golden hedge-hyssop Hydrilla verticillata hydrilla, Florida elodea, water thyme Isoetes ×eatonii Eaton's quillwort Isoetes acadiensis Acadian quillwort Isoetes echinospora spiny-spored quillwort Engelmann's quillwort, Appalachian Isoetes engelmanii quillwort Isoetes sp. quillwort Isoetes tuckermannii Tuckerman's quillwort Juncus militaris bayonet rush Juncus pelocarpus brown-fruited rush Juncus sp. rush Lemna minor common duckweed, lesser duckweed Lobelia dortmanna Dortmann's cardinalflower Ludwigia ×lacustris lake ludwigia Ludwigia palustris marsh primrose-willow, marsh seedbox Ludwigia sp. primrose-willow, seedbox Marsilea quadrifolia European waterclover Megalodonta beckii water marigold Myriophyllum alterniflorum alternate-flowered water milfoil Scientific Name Common Name Myriophyllum aquaticum parrot feather, brazilian watermilfoil variable-leaf water milfoil, various-leaved Myriophyllum heterophyllum water milfoil, changeleaf parrotfeather Myriophyllum heterophyllum × M. laxum variable water milfoil hybrid Myriophyllum humlie low water milfoil northern water milfoil, American water Myriophyllum sibiricum milfoil Myriophyllum spicatum Eurasian water milfoil Myriophyllum tenellum slender water milfoil Najas flexilis nodding waternymph, slender naiad Najas gracillima slender waternymph Najas guadalupensis southern naiad, southern waternymph Najas minor brittle waternymph Nelumbo lutea American lotus Nuphar variegata yellow water lily Nymphaea odorata white water lily, American water lily American white water lily, magnolia water Nymphaea odorata ssp. tuberosa lily Nymphoides cordata little floating heart Nymphoides peltata yellow floating heart Phragmites australis common reed Polygonum amphibium water smartweed, water knotweed Polygonum hydropiperoides swamp smartweed Polygonum sp. knotweed Pontederia cordata pickerelweed Potamogeton amplifolius large-leaf pondweed Potamogeton bicupulatus snailseed pondweed Potamogeton confervoides Tuckerman's pondweed Potamogeton crispus curly leaf pondweed Potamogeton epihydrus ribbon-leaf pondweed Potamogeton foliosus leafy pondweed Potamogeton friesii Fries' pondweed variable pondweed, grass-leaved Potamogeton gramineus pondweed Potamogeton illinoensis Illinois pondweed Potamogeton natans floating-leaf pondweed Potamogeton nodosus long-leaf pondweed Potamogeton oakesianus Oakes' pondweed Potamogeton obtusifolius bluntleaf pondweed Potamogeton perfoliatus clasping-leaf pondweed Potamogeton praelongus white stem pondweed Potamogeton pulcher spotted pondweed, heartleaf pondweed Potamogeton pusillus small pondweed Potamogeton pusillus ssp. gemmiparus small pondweed Potamogeton pusillus ssp. tenuissimus small pondweed Potamogeton robbinsii Robbins pondweed Potamogeton sp. pondweed Potamogeton spirillus spiral pondweed Potamogeton vaseyi Vasey's pondweed Potamogeton zosteriformis flat-stemmed pondweed Proserpinaca palustris marsh mermaid weed Scientific Name Common Name white water crowfoot, white water Ranunculus longirostris buttercup Sagittaria cuneata arumleaf arrowhead Sagittaria graminea grass-leaf arrowhead, grassy arrowhead Sagittaria latifolia broadleaf arrowhead Sagittaria sp. arrowhead Sparganium americanum American bur-reed Sparganium sp. bur-reed Spirodela polyrhiza great duckweed, large duckweed Stuckenia pectinata Sago pondweed Trapa natans water chestnut, water nut Utricularia geminiscapa hiddenfruit bladderwort Utricularia gibba humped bladderwort Utricularia intermedia flat-leaf bladderwort Utricularia macrorhiza (=U. vulgaris ) common bladderwort Utricularia minor lesser bladderwort Utricularia purpurea purple bladderwort Utricularia radiata floating bladderwort Vallisneria americana tapegrass, eel grass, wild celery Wolffia brasiliensis Brazilian watermeal Zannichellia palistris horned pondweed Zosterella dubia water stargrass