High Eradication Impedence, Low Net Area. (Department of Agriculture (2014). Biosecurity Workshops Report. Department of Agriculture); Rumex X Propinquus Is A Sterile Spontaneous Hybrid Between Two Widespread Introduced Species, R. Crispus And R. Obtusifolius. ( Department of Agriculture (2014). Biosecurity Workshops Report. Department of Agriculture.Pdf); Very rare. Recorded on East Falkland (Mount Pleasant Complex). Casual. Possibly locally extirpated. All plants controlled (R. Lewis 2012). Not cultivated. (Upson R. & Lewis R. (2014). Updated atlas and checklist. Report to Falklands Conservation. 225 pp); Limited. Very Rare. Found to the east of the island. Possibly extirpated. ([Heller, 2019] Falklands Conservation Flora and Fauna List (Unknown));
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Hybrid that arose in C. and N. Europe. (Upson R. & Lewis R. (2014). Updated atlas and checklist. Report to Falklands Conservation. 225 pp);
Blake D., Stanworth A., Wong L, Pagad S. (2020). Global Register of Introduced and Invasive Species of Falkland Islands (Islas Malvinas). Version 1.2. Invasive Species Specialist Group ISSG.; Department of Agriculture (2014). Biosecurity Workshops Report. Department of Agriculture.pdf; Creation of a Risk Assessment Protocol for Cultivated Species in the Falkland Islands and Volunteer invasive plant recording sheet (Unknown).; Upson R. & Lewis R. (2014). Updated atlas and checklist. Report to Falklands Conservation. 225 pp; ([Heller, 2019] Falklands Conservation Flora and Fauna List (Unknown))