The new species Teuvoahtiana meridionalis is described from Antarctica and Southern South America. Even though the new species is morphologically and chemically variable, it is molecularly monophyletic and located in the genus Teuvoahtiana in the subfamily Xanthorioideae. The genetic variation could not be correlated to the variation in any other characters that could support any further division of the species. Teuvoahtiana, that includes three other species, has a varied morphology and is in need of further studies.