Unidentified Pondweeds: Help identify these as yet identified pondweeds!
Alpine Pondweed, Northern Pondweed, Reddish Pondweed: Potamogeton alpinus (Synonyms: Potamogeton alpinus var. subellipticus, Potamogeton alpinus ssp. tenuifolius, Potamogeton alpinus var. subellipticus, Potamogeton alpinus var. tenuifolius)
Broad-leaved Pondweed, Largeleaf Pondweed, Large-leaved Pondweed: Potamogeton amplifolius
Curled Pondweed, Curly Pondweed: Potamogeton crispus -
Diverse-leaved Pondweed, Waterthread Pondweed: Potamogeton diversifolius (Synonyms: Potamogeton capillaceus, Potamogeton capillaceus var. atripes, Potamogeton diversifolius var. multidenticulatus)
Ribbonleaf Pondweed, Ribbon-leaved Pondweed: Potamogeton epihydrus (Synonyms: Potamogeton epihydrus ssp. nuttallii, Potamogeton epihydrus var. epihydrus, Potamogeton epihydrus var. nuttallii, Potamogeton epihydrus var. ramosus)
Fibrous-stipuled Pondweed, Leafy Pondweed: Potamogeton fibrillosus (Synonyms: Potamogeton foliosus ssp. fibrillosus, Potamogeton foliosus var. fibrillosus)
Fineleaf Pondweed, Slenderleaf Pondweed: Potamogeton filiformis var. alpinus (Synonyms: Coleogeton filiformis ssp. alpinus, Potamogeton filiformis var. borealis, Potamogeton filiformis var. macounii, Stuckenia filiformis ssp. alpina, Stuckenia filiformis var. alpina)
Western Fineleaf Pondweed, Western Pondweed: Potamogeton filiformis var. occidentalis (Synonyms: Coleogeton filiformis ssp. occidentalis, Potamogeton interior, Stuckenia filiformis ssp. occidentalis, Stuckenia filiformis var. occidentalis)
Leafy Pondweed: Potamogeton foliosus ssp. foliosus (Synonyms: Potamogeton curtissii, Potamogeton foliosus var. foliosus, Potamogeton foliosus var. genuinus, Potamogeton foliosus var. macellus) -
Grassy Pondweed, Variable Pondweed, Variableleaf Pondweed, Variable-leaved Pondweed: Potamogeton gramineus (Synonyms: Potamogeton gramineus var. gramineus, Potamogeton gramineus var. graminifolius, Potamogeton gramineus var. maximus, Potamogeton gramineus var. myriophyllus, Potamogeton gramineus var. typicus, Potamogeton heterophyllus)
Illinois Pondweed: Potamogeton illinoensis (Synonyms: Potamogeton angustifolius, Potamogeton heterophyllus, Potamogeton lucens)
Floating-leaved Pondweed, Floating Pondweed: Potamogeton natans -
Loddon's Pondweed, Longleaf Pondweed, Long-leaved Pondweed: Potamogeton nodosus (Synonyms: Potamogeton americanus, Potamogeton fluitans) -
Fennel-leaved Pondweed, Sago Pondweed: Potamogeton pectinatus (Synonym: Stuckenia pectinata) -
White-stalked Pondweed, Whitestem Pondweed: Potamogeton praelongus (Synonym: Potamogeton praelongus var. angustifolius)
Small Pondweed: Potamogeton pusillus ssp. pusillus (Synonyms: Potamogeton lateralis, Potamogeton panormitanus, Potamogeton panormitanus var. major, Potamogeton panormitanus var. minor, Potamogeton pusillus var. minor, Potatmogeton pusillus var. pusillus) -
Berchtold's Pondweed: Potamogeton pusillus ssp. tenuissimus (Synonyms: Potamogeton berchtoldii, Potamogeton berchtoldii var. acuminatus, Potamogeton berchtoldii var. colpophilus, Potamogeton berchtoldii var. lacunatus, Potamogeton berchtoldii var. mucronatus, Potamogeton berchtoldii var. polyphyllus, Potamogeton berchtoldii var. tenuissimus, Potamogeton pusillus var. mucronatus, Potamogeton pusillus var. tenuissimus) -
Clasping-leaved Pondweed, Richardson's Pondweed: Potamogeton richardsonii (Synonyms: Potamogeton perfoliatus, Potamogeton perfoliatus ssp. richardsonii, Potamogeton perfoliatus var. richardsonii)
Fern Pondweed, Robbins' Pondweed: Potamogeton robbinsii
Broadleaf Pondweed, Striped Pondweed: Potamogeton striatus (Synonyms: Potamogeton filiformis var. latifolius, Potamogeton latifolius, Stuckenia striata)
Sheathed Pondweed, Sheathing Pondweed: Potamogeton vaginatus (Synonym: Stuckenia vaginata)
Eel Grass Pondweed, Eel-grass Pondweed, Flat-stem Pondweed: Potamogeton zosteriformis (Synonyms: Potamogeton compressus, Potamogeton zosterifolius ssp. zosteriformis)