Wikipedia
Tetrachondra
Tetrachondra is a plant genus and a member of the family Tetrachondraceae. It comprises two species of creeping succulent, perennial, aquatic or semi-aquatic herbaceous plants. Its distribution range is disjunct: one species is endemic to New Zealand (mainly Stewart Island, Otago and Southland) while the other one is endemic to southern Patagonia and Tierra del Fuego. These plants bear essential oils.