One of the most widespread aliens at the islands [1]. Tristan: The most abundant and widespread alien species on the island [2]. Inaccessible: Presently very widespread [3].
occurs in most vegetation types and is dominant with Rumex acetosella in the meadows on the lower part of the Park; at Inaccessible and Gough it is common along streams and paths, often forming large monospecific stands; at Nightingale it is confined to disturbed places such as along paths [1]. Tristan: It is found in all habitats, often reaching high cover values [2]. Gough: abundant in disturbed sites and along stream banks, where it often reaches absolute dominance [3]. Inaccessible: common and abundant on the coast and along stream banks on the plateau. Dominant, often in monoculture, in previously grazed sites (Ryan & Glass 2001) In tussock, wet heath and fernbush (Ryan & Glass 2001). [3]. Nightingale: Common in disturbed areas, especially along the path from the huts to the Ponds (Roux et al 1992) [3].
Where it often reaches absolute dominance [3]
Gough: First collected in 1955 at the Glen. Inaccessible: First collected on Inaccessible by Christophersen in Feb 1938. Nightingale: First collected on Nightingale by Christophersen in Feb 1938
[1] Ryan, P. (ed.) (2007). Field Guide to the Animals and Plants of Tristan da Cunha and Gough Island. Pisces Publications, Newbury. 162 pp; [2] Gremmen, N.J.M. and R.L. Halbertsma (2009). Alien plants and their impact on Tristan da Cunha. Report Data-Analyse Ecology, Diever, NL.; [3] Gremmen, N. J. M. (2010). Alien vascular plants of Inaccessible, Nightingale and Gough Islands (Tristan da Cunha Group).; [4] Ryan, P. & Glass, J.P. (2001). Inaccessible Island Nature Reserve Management Plan. Government of Tristan da Cunha, Edinburgh, Tristan da Cunha. 65 pp.; [5] Roux, J.P., Ryan, P.G., Milton, S.J. and Moloney, C.L. (1992) Vegetation and checklist of Inaccessible Island, central South Atlantic Ocean, with notes on Nightingale Island. Bothalia 22 (1): 93 – 109.