Single plant controlled in 2011 at Grytviken. Nothing found since. (Floyd, K. (2013) Weeds on South Georgia. Government of South Georgia and the South Sandwich Islands.); Transient. Likely eradicated. Previously recorded at Grytviken, was not seen this season. (Floyd, K. (2018) Non-native plants on South Georgia: Season Report 2017/18. Indigena Biosecurity International, Government of South Georgia and the South Sandwich Islands);
Terrestrial
James, R., Floyd, K., Pagad, S. & Wong, L.J. (2020) Global Register of Introduced and Invasive Species of South Georgia and the South Sandwich Islands. Version 1.4. Invasive Species Specialist Group ISSG. Checklist dataset; Greene, S.W. & Walton, D.W.H. (1975). An annotated checklist of the sub-Antarctic and Antarctic vascular flora, Polar Record, 17(110), pp. 473, 484.; Floyd, K. (2013) Weeds on South Georgia. Government of South Georgia and the South Sandwich Islands.; Government of South Georgia & the South Sandwich Islands (2016) South Georgia Non-Native Plant Management Strategy 2016-2020. Government House, Stanley, Falkland Islands.; Floyd, K. (2018) Non-native plants on South Georgia: Season Report 2017/18. Indigena Biosecurity International, Government of South Georgia and the South Sandwich Islands;