 The other two species, "S. dilatatum" and "S. armeria", that used to be included in this complex are tetraploid (2n = 60) and may represent polyploid speciation.The three species also represented different habitats and ranges, with "S. graminifolium" distributed widely in south-eastern continental Australia and Tasmania, "S. dilatatum" in the subalpine areas of south-eastern Australia and widely distributed in Tasmania, and "S. armeria" in the littoral habitats in Tasmania from Macquarie Harbour to the Tasman Peninsula.