Saltwort is a common name for various genera of flowering plants that thrive in salty environments, typically in coastal salt marshes and seashores, including:
The ashes of these plants yield soda ash, which is an important ingredient for glassmaking and soapmaking.
See also glasswort – glassworts are saltworts, and saltworts can be glassworts
See also Saltbush aka Atriplex, a genus thriving in salty environments