| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
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| Lythraceae | Ammannia auriculata | Eared Redstem | Swamps, ditches, other wetlands. | MS, LA, SD, NM, and AZ, south to TX, Mexico, Central America, and n. South America. Perhaps only native in the Old World. | 
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| Lythraceae | Ammannia coccinea | Scarlet Toothcup | Marshes, ditches, exposed muddy river shores and banks, wet pine flatwoods, other wet places. | NJ, OH, IN, IL, IA, and SD south to s. FL and TX; disjunct in CA; south through Mexico and Central America to n. South America; West Indies. | 
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| Lythraceae | Ammannia grayi | Stalkflower, Willowleaf Heimia, Hachinal | Moist alkaline soils around springs. | S. TX, w. TX, s. NM south to Mexico (COA, SON). | 
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| Lythraceae | Ammannia latifolia | Pink Redstem | Brackish to fresh tidal marshes, wet places, ditches. | NJ south to s. FL and west to TX (mostly on the Coastal Plain), and also in the West Indies, Yucatan, Central America, and South America. | 
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| Lythraceae | Ammannia robusta | Grand Redstem | Marshes, ditches, swamps. | OH and BC south to w. KY, w. TN, LA, TX, CA, Mexico, and Belize; West Indies; introduced in NJ and n. South America. | 
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