Alisma

Alisma subcordatum Raf. = Alisma plantago-aquatica var. parviflorum (Pursh) Torrey lesser water plantain, southern water plantain Native

Alisma triviale Pursh = Alisma plantago-aquatica var. americanum Schultes & Schultes larger water plantain, northern water plantain Native

Sagittaria

Sagittaria engelmanniana J.G.Smith acid-water arrowhead, Engelmann's arrowhead Native

Sagittaria filiformis J.G.Smith = Sagittaria stagnorum Small = Sagittaria subulata var. gracillima (S.Watson) J.G.Smith threadleaf arrowhead, riffle arrowhead Native

Sagittaria graminea Michx. grassleaf arrowhead Native

Sagittaria latifolia Willd. = Sagittaria latifolia var. obtusa (Muhl.) Wieg. common arrowhead, duck potato Native

Sagittaria subulata (L.) Buch. river arrowhead Native — Historic

Sagittaria teres S.Watson pondshore arrowhead, terete arrowhead Native — Special Concern