marshwort

/ ˈmɑːʃˌwɜːt /

noun

a prostrate creeping aquatic perennial umbelliferous plant of the genus Apium , esp A. inundatum , having small white flowers: related to wild celery

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You shall have the three sprigs, the sprig of watercress, and the sprig of marshwort, and the sprig of seaweed.