Apium australe is a species of the genus Apium of the family Apiaceae. It is a perennial herb with a distribution in salt-marsh and saline habitats of Southern South America.Louis-Marie Aubert du Petit-Thouars, "Esquisse de la Flore de l'Isle de Tristan d'Acugna (1808)" p. 43 in his Mélanges de botanique et de voyages (Paris: Arthus Bertrand, 1811).
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