Dowload the complete checklist in Adobe pdf format - Arthur Haines

Potamogeton praelongus Wulfen Potamogeton praelongus var. angustifolius white-stemmed pondweed
Graebn.
Potamogeton praelongus ×
richardsonii
Potamogeton pulcher Tuckerman
spotted pondweed
Potamogeton pusillus L. Potamogeton lateralis Morong, in part; small pondweed
Potamogeton pusillus var. minor (Biv.) Fern. &
Schub.
Potamogeton richardsonii (Benn.) Potamogeton perfoliatus var. richardsonii Richardson's pondweed
Rydb.
Benn.
Potamogeton robbinsii Oakes
Robbins' pondweed
Potamogeton amplifolius × P. illinoensis
Potamogeton ×sparganiifolius Potamogeton gramineus × P. natans
Laestad. ex Fries
Potamogeton ×spathuliformis (J.W. Potamogeton gramineus × P. illinoensis
Robbins) Morong
Potamogeton spirillus Tuckerman
northern snail-seed pondweed
Potamogeton strictifolius Benn. Potamogeton longiligulatus Fern.;
straight-leaved pondweed
Potamogeton strictifolius var. rutiloides Fern.
Potamogeton vaseyi J.W. Robbins Potamogeton lateralis Morong, in part Vasey's pondweed
Potamogeton ×versicolor Z. Kaplan, Potamogeton epihydrus × P. perfoliatus
Hellquist, & Fehrer
Potamogeton zosteriformis Fern. Potamogeton zosterifolius Schumacher ssp. flat-stem pondweed
zosteriformis (Fern.) Hultén
Stuckenia filiformis (Pers.) Boerner Coleogeton filiformis (Pers.) D. Les & R. thread-leaved false pondweed
Haynes ssp. alpinus (Blytt) D. Les & R.
Haynes; Coleogeton filiformis (Pers.) D. Les &
R. Haynes ssp. occidentalis (J.W. Robbins) D.H.
Les & Haynes; Potamogeton filiformis Pers.
var. alpinus (Blytt) Aschers. & Graebn.;
Potamogeton filiformis Pers. var. macounii
Morong; Potamogeton filiformis Pers. var.
occidentalis (J.W. Robbins) Morong; Stuckenia
filiformis ssp. alpina (Blytt) Haynes, D.H. Les,
& M. Kral; Stuckenia filiformis ssp.
occidentalis (J.W. Robbins) Haynes, D.H. Les,
Stuckenia pectinata (L.) Boerner Coleogeton pectinatus (L.) D.H. Les & Haynes;
Potamogeton borealis Raf.; Potamogeton
filiformis Pers. var. borealis (Raf.) St. John;
Potamogeton pectinatus L
Zannichellia palustris L. Zannichellia palustris var. major (Hartman)
Koch
Ruppiaceae
Ruppia maritima L. Ruppia maritima var. longipes Hagstr.;
Ruppia maritima var. obliqua (Schur) Aschers.
& Graebn.; Ruppia maritima var. rostrata
Agardh; Ruppia maritima var. subcapitata
Fern & Wieg
Sago false pondweed
horned-pondweed
ditch-grass family
beaked ditch-grass