While working on the taxonomic treatment of the family Gunneraceae for the Flora of Argentina, provisional typification for the minute herbaceous species Gunnera lobata and G. magellanica, and the giant herb G. tinctoria, as well as for some of their synonyms, was detected. Here, we designate lectotypes for G. lobata, G. magellanica, G. falklandica (= G. magellanica), and Panke tinctoria (= G. tinctoria), a neotype for G. reichei (= G. magellanica), and an epitype for G. tinctoria.