Real Dictionary

saltwort in American English
any of a genus (Salsola) of plants of the goosefoot family, growing on seashores or saline soils, including the Russian thistle
noun: any of various plants of sea beaches, salt marshes, and alkaline regions, esp. belonging to the genus Salsola, of the goosefoot family, as S. kali, a bushy plant having prickly leaves, or belonging to the genus Salicornia

saltwort in British English
noun: any of several chenopodiaceous plants of the genus Salsola, esp S. kali, of beaches and salt marshes, which has prickly leaves, striped stems, and small green flowers