| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
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| Lythraceae | Lythrum alatum | Northern Winged Loosestrife | Calcareous meadows, marl fens, and disturbed wet calcareous places. | ME, NY, MI, and ND south to sc. VA, e. TN, nw. GA, n. AL, n. AR, ne. OK, and CO. Material alleged to be this taxon in the FL peninsula has been treated as an endemic species (Franck & Werner 2023). | 
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| Lythraceae | Lythrum californicum | California Loosestrife | Low, moist areas. | KS west to CA, south to TX, NM, AZ, and c. Mexico. | |
| Lythraceae | Lythrum curtissii | Curtiss's Loosestrife | Calcareous swamps, seepage areas. | Sw. GA south to Panhandle FL, and disjunct in ne. FL (St. Johns County [Slaughter 2014]); the report from Emanuel County, GA (Jones & Coile 1988) is in error. | 
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| Lythraceae | Lythrum flagellare | Florida Loosestrife | Wet Florida prairies, floodplain marshes, moist roadsides and ditches. | C. and peninsular FL. Primarily occurring in west-central and southwest peninsular FL, from Hillsborough south to Collier county. | 
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| Lythraceae | Lythrum hyssopifolia | Annual Loosestrife | Salt marshes, other wet soils; probably only adventive from Eurasia, but sometimes interpreted as native from ME to NJ. | Probably native only in Eurasia; present in North America in the northeast and on the west coast. | 
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| Lythraceae | Lythrum lanceolatum | Southern Winged Loosestrife | Pine savannas, pine flatwoods, blackland prairies, coastal prairies, marshes, swamps, other moist to wet places, ditches. | Se. VA, se. NC, SC, GA, AL, MS, n. AR, s. MO, and OK south to s. FL, s. TX, Mexico; West Indies. | 
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| Lythraceae | Lythrum lineare | Narrowleaf Loosestrife, Wand Loosestrife, Saltmarsh Loosestrife | Nearly fresh, brackish, and saline marshes. | NJ south to s. FL and west to TX. | 
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| Lythraceae | Lythrum nieuwlandii | | Marshes, herbaceous-dominated wetlands | Apparently endemic to n. peninsular FL (Alachua, Citrus, and Hernando counties). | |
| Lythraceae | Lythrum salicaria | Purple Loosestrife | Swamps, marshes, other wet places. | Native of Eurasia. An extremely noxious weed in the ne. United States, aggressively colonizing and coming to dominate a wide variety of freshwater wetlands, sometimes to the near exclusion of native vegetation. | 
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| Lythraceae | Lythrum thymifolium | Thymelaef Loosestrife | On ballast. | Native of Mediterranean Europe. | |
| Lythraceae | Lythrum virgatum | European Wand Loosestrife | Marshes and ditches. | Native of Europe. | 
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