Tetroncium is a genus of plants in the Juncaginaceae described as a genus in 1808.

[2][3] It contains only one known species, Tetroncium magellanicum, known from a few sub-Antarctic islands: Tierra Del Fuego (Chile and Argentina), Falkland Islands, and Gough Island.

[1][4][5][6] The plant got the name magellanicum because the original description was describing the sample found near the Strait of Magellan.

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