Spreading and forming extensive cover in many places along the lower slopes of the Upper Rock. (Species that have been introduced into Gibraltar. (Unknown).); Species may spread into the Upper Rock Nature Reserve with ease in the near future. Large stands within and around Upper Rock. (Perez, C.E. & Bensusan, K. (2005) The Upper Rock Nature Reserve, A Management and Action Plan. The Gibraltar Ornithological & Natural History Society. Gibraltar); Common. (Gibraltar flora database (Unknown));
Invasive (Gibraltar Nature Reserve Management Plan (2019). Department of the Environment, Heritage and Climate Change. H.M. Government of Gibraltar; Species that have been introduced into Gibraltar. (Unknown).; Perez, C.E. & Bensusan, K. (2005) The Upper Rock Nature Reserve, A Management and Action Plan. The Gibraltar Ornithological & Natural History Society. Gibraltar; )
Senecio angulatus poses a very serious threat given the rate at which they spread and smother native flora. (Gibraltar Nature Reserve Management Plan (2019). Department of the Environment, Heritage and Climate Change. H.M. Government of Gibraltar.); Spreads rapidly and dominates extensively. (Perez, C.E. & Bensusan, K. (2005) The Upper Rock Nature Reserve, A Management and Action Plan. The Gibraltar Ornithological & Natural History Society. Gibraltar);
Terrestrial. Introduced from South Africa. (Pagad S., Wong L.J. (2020): Global Register of Introduced and Invasive Species – Gibraltar. v1.1. Invasive Species Specialist Group ISSG; Pagad S, Wong L J (2020): Global Register of Introduced and Invasive Species of Gibraltar. v1.1. Invasive Species Specialist Group ISSG.76);
Pagad S., Wong L.J. (2020): Global Register of Introduced and Invasive Species – Gibraltar. v1.1. Invasive Species Specialist Group ISSG; Gibraltar Nature Reserve Management Plan (2019). Department of the Environment, Heritage and Climate Change. H.M. Government of Gibraltar.; Species that have been introduced into Gibraltar. (Unknown).; Perez, C.E. & Bensusan, K. (2005) The Upper Rock Nature Reserve, A Management and Action Plan. The Gibraltar Ornithological & Natural History Society. Gibraltar; Gibraltar flora database (Unknown);