| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|
| Crassulaceae | Crassula aquatica | Pygmyweed | Tidal marshes and shores, shores and mudflats of artificial lakes and reservoirs. | Occurring in tidal marshes and shores, south to MD and se. PA, and also inland along shores and mudflats of inland reservoirs in SC, GA, and AL (Kartesz 1999, FNA, England 2013). Reported for AL by England (2013). | 
|
| Crassulaceae | Crassula drummondii | | Pond margins, damp bare ground, mudflats, wet pathways, eastwards in a waste area around wool-combing mill (where perhaps merely a waif). | KS and CO south to TX. | |
| Crassulaceae | Crassula longipes | Louisiana Pygmyweed | Aquatic or stranded on sand or mud. | MS and AR south to LA, TX, and Mexico; also s. South America. | |
| Crassulaceae | Crassula solieri | | Shores. | W. North America, C. and se. TX; Mexico (Baja California); Chile. | |