| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
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| Alismataceae | Sagittaria ambigua | Plains Arrowhead, Kansas Arrowhead | Pond and lake shores, ditches. | IN and w. IL west to KS, south to s. MO and e. OK. | 
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| Alismataceae | Sagittaria australis | Appalachian Arrowhead, Longbeak Arrowhead | Marshes, swamps, rivershores, backwaters, margins of ponds and lakes. | NY west to s. IN and se. MO, south to SC, Panhandle FL, and MS. | 
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| Alismataceae | Sagittaria brevirostra | Midwestern Arrowhead, Shortbeak Arrowhead | Shores, shallow water. | OH west to ND, south to n. VA, e. TN, AL, and TX. | 
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| Alismataceae | Sagittaria calycina | Hooded Arrowhead | Seasonally exposed shores and flats of ponds, pools, and impoundments. | N. OH and MI west to SD and CO, south to sw. VA, c. TN, LA, TX, and Mexico; disjunct in CA. Scattered occurrences eastwards are difficult to interpret as to 'nativeness', being primarily or entirely in manmade wetlands, to which they may have arrived by a diversity of means. First reported for SC by Hill & Horn (1997). | 
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| Alismataceae | Sagittaria chapmanii | Chapman's Arrowhead | Limesink (doline) ponds with drawdown hydrology, mucky ditches. | E. NC south to s. FL, west to e. LA. First reported for SC by Nelson & Kely (1997). reports from west of the Mississippi River are based on misidentifications of S. platyphylla. | 
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| Alismataceae | Sagittaria cuneata | Northern Arrowhead, Arumleaf Arrowhead, Wapato | Ponds, marshes, shores. | NS west to AK, south to CT, nw. NJ, nw. PA, IN, IL, IA, OK, n. TX, NM, AZ, and CA. | 
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| Alismataceae | Sagittaria engelmanniana | Blackwater Arrowhead, Engelmann's Arrowhead | Blackwater streambanks, sphagnum bogs, pocosins, beaver ponds. | MA and NY south to s. FL and s. AL, primarily on the Coastal Plain (rarely disjunct inland). | 
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| Alismataceae | Sagittaria fasciculata | Bunched Arrowhead | Bogs, ditches adjacent to drained bogs, wooded seepage areas. | Endemic to a several-county area in sw. NC and nw. SC, where most of its former habitat has been drained. | 
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| Alismataceae | Sagittaria filiformis | Threadleaf Arrowhead | Swiftly flowing water of blackwater rivers and streams, blackwater lake shores, tidal waters. | As conceived here, probably ranging from MA south to s. FL, s. AL, and s. MS. | 
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| Alismataceae | Sagittaria graminea | Grassleaf Arrowhead | Marshes, ponds, freshwater and oligohaline tidal marshes. | NL (Newfoundland) and NL (Labrador) west to MN and SD, south to s. FL and c. TX; West Indies. | 
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| Alismataceae | Sagittaria guayanensis ssp. guayanensis | Guayana Arrowhead | Disturbed wetlands, rice fields. | Native of Mexico, Central America, South America, and the West Indies. | |
| Alismataceae | Sagittaria isoetiformis | Quillwort Arrowhead | Pineland ponds, clay-based Carolina bays, natural lake shoreline marshes, other seasonally flooded depressions. | Se. NC south to s. peninsular FL, west to s. MS (Sorrie & Leonard 1999) | 
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| Alismataceae | Sagittaria kurziana | Spring-tape | Spring-runs. | Panhandle and n. and c. peninsular FL. | |
| Alismataceae | Sagittaria lancifolia var. lancifolia | Bulltongue Arrowhead | Marshes, swamps. | E. SC south to s. FL, west to FL Panhandle; West Indies; n. South America. Reports further west in the Gulf Coastal Plain (MS and LA) are unverified. | 
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| Alismataceae | Sagittaria lancifolia var. media | Scimitar Arrowhead | Freshwater to brackish (mesohaline) tidal marshes. | S. DE south to ne. FL, FL Panhandle, west to TX; scattered in Central America. | 
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| Alismataceae | Sagittaria latifolia var. latifolia | Common Arrowhead, Broadleaf Arrowhead | Marshes, swamps, farm ponds, ditches, bogs. | NS west to BC, south to tropical America (rare in the Appalachian region). | 
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| Alismataceae | Sagittaria latifolia var. pubescens | Common Arrowhead, Broadleaf Arrowhead | Bogs, marshes. | C. PA, OH, and TN, south to n. FL and e. LA, centered in the Appalachians. | 
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| Alismataceae | Sagittaria longiloba | Long-lobe Arrowhead, Flecha de Agua | Swamps, ponds, ditches. | NE, NM, AZ, and CA south to s. TX and Mexico; Nicaragua, Venezuela. | |
| Alismataceae | Sagittaria macrocarpa | | Beaverponds, old millponds, sometimes under gum and maple canopy. | Apparently endemic to the Coastal Plain of the Carolinas; potentially to be expected in e. GA | 
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| Alismataceae | Sagittaria montevidensis | Giant Arrowhead | Disturbed areas, marshes. | Native of South America. Most of the collections from the southeastern United States are old collections around major seaports, suggesting that this plant was introduced on the ballast of sailing ships. | 
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| Alismataceae | Sagittaria papillosa | Nipple-bract Arrowhead | Bogs, swamps, ditches, depressions. | C. AR and se. OK south to s. LA and c. TX; rarely disjunct east of the Mississippi in se. LA and s. MS. | 
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| Alismataceae | Sagittaria platyphylla | Delta Arrowhead | Marshes, ditches, farm ponds, pondcypress wetlands, canals. | VA, OH, IL, MO, and OK, south to FL, TX, and Mexico. The distribution of this species is primarily in the Mississippi drainage; occurrences east of the Appalachians may be introduced, either by humans or by waterfowl. First reported for VA by Wieboldt et al. (1998). Reported for c. FL (Orange County) by Dalager (2022, who considers it as introduced there and likely via the aquatic plant industry. | 
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| Alismataceae | Sagittaria rigida | Sessile-fruited Arrowhead, Stiff Arrowhead | Natural mountain ponds, wet meadows. | ME and MN, south to w. VA, nc. TN, MO, nw. AR, and NE. | 
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| Alismataceae | Sagittaria secundifolia | Little River Water-plantain, Kral's Arrowhead | Crevices in sandstone bedrock in streambeds. | Endemic to se. TN, nw. GA, and nc. AL. | 
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| Alismataceae | Sagittaria spongiosa | Tidal Arrowhead | Tidal marshes and mud flats. | NB south to e. NC along the coast. | 
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| Alismataceae | Sagittaria subulata | Dwarf Arrowhead, Awl-leaf Arrowhead | Tidal marshes and mud flats. | MA and NY south to n. peninsular FL and MS. | 
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| Alismataceae | Sagittaria teres | Slender Arrowhead | Ponds. | MA south to s. NJ. | 
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| Alismataceae | Sagittaria weatherbiana | Weatherby’s Arrowhead | Fresh to brackish marshes, tidal cypress-gum swamps, streambanks, pineland pools. | Se. VA south to Panhandle FL. | 
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