For the purposes of this category, the "Subantarctic Islands" are defined within the WGSRPD region of the "Subantarctic Islands" in the Antarctic botanical continent, typically by the political boundaries of their constituents, according to the WGSRPD. This region includes the following areas:
Native taxa of the lowest rank are included if they occur widely in the region, otherwise they should be included in the flora of one or more of the constituent areas. Higher taxa are included only if endemic.