Naturalised. It is widespread at Stromness and on the Pintail Peninsula and a small population was located at Grytviken. (Floyd, K. (2013) Weeds on South Georgia. Government of South Georgia and the South Sandwich Islands.); Have a moderate population density could dominate the vegetated landscape. (Government of South Georgia & the South Sandwich Islands (2016) South Georgia Non-Native Plant Management Strategy 2016-2020. Government House, Stanley, Falkland Islands.); Locally common. It was found to occupy large areas within Stromness Bay with outlying population on Grass Island, Olsen Valley, Kelp Point and Grytviken. (Government of South Georgia and the South Sandwich Islands (2015) Alien plants on South Georgia: Season Report 2014-2015. Government of South Georgia and the South Sandwich Islands.); Widespread naturalised. Covers very large areas in Karrakatta Valley, Pintail Peninsula, Shackleton Valley and Hansen Valley with outlier patches at Cape Saunders, Husdal, Olsen Valley, Grytviken, Grass Island and Kelp Point. It was also recorded this season for the first time on Barff Peninsula (at Ocean Harbour). This grass has spread rapidly within Stromness Bay. (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);
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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; 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.; Government of South Georgia and the South Sandwich Islands (2015) Alien plants on South Georgia: Season Report 2014-2015. Government of South Georgia and the South Sandwich Islands.; Government of South Georgia and the South Sandwich Islands (2015) Alien plants on South Georgia: Season Report 2014-2015. Government of South Georgia and the South Sandwich 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;