Tetroncium is a genus of plants in the Juncaginaceae described as a genus in 1808.Willdenow, Carl Ludwig von. 1808. Der Gesellschaft Naturforschender Freunde zu Berlin Magazin für die neuesten Entdeckungen in der Gesammten Naturkunde 2: 17Tropicos, Tetroncium Willd. 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.Kew World Checklist of Selected Plant FamiliesMoore, D. M. 1974. Plantas vasculares nativas de Tierra del Fuego. Anales del Instituto de la Patagonia: Serie Ciencias Naturales, Punta Arenas (Chile) 5(142): 107–119Dudley, T. R. 1981. Notas taxonómicas y de nomenclatura sobre la Flora de Islas de los Estados, Tierra del Fuego, Argentina. Rhodora 83: 477–579Moore, D. M. 1965. Some recent records of native and alien flowering plants from the Falkland Islands. British Antarctic Survey Bulletin 7: 29–35. The plant got the name magellanicum because the original description was describing the sample found near the Strait of Magellan.
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