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Scientific Name | Rhyssolobium dumosum E.Mey. |
Higher Classification | Dicotyledons |
Family | APOCYNACEAE |
National Status |
Status and Criteria | Endangered B1ab(iii,v)+2ab(iii,v) |
Assessment Date | 2015/06/10 |
Assessor(s) | L. von Staden & P.C.V. Van Wyk |
Justification | National EOO 16 km², plants at two known locations are declining due to ongoing habitat loss and degradation. |
Distribution |
Endemism | Not endemic to South Africa |
Provincial distribution | Northern Cape |
Range | Southern Namibia and the Gariep Valley east of Alexander Bay. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Western Gariep Lowland Desert |
Description | Barren stony flats and gentle slopes. |
Threats |
| This species is threatened by severe ongoing habitat loss and degradation across its range in South Africa, as a result of mining and overgrazing. In the lower Gariep Valley east of Alexander Bay, thousands of livestock congregate at a livestock outpost right next to a subpopulation of this species. A possible second subpopulation, known from historical records is threatened by severe habitat loss and degradation as a result of mining, and surveys are needed to confirm that the population is still extant. |
Population |
This species has a very localized distribution in South Africa, where it is known from a 20 km stretch along the south bank of the Orange River. Population decline due to overgrazing has been observed. It is somewhat more widespread in southern Namibia, but records are sparse and disjunct from the South African population. It may be under sampled in Namibia due to access restrictions on diamond mining areas.
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Population trend | Decreasing |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Rhyssolobium dumosum E.Mey. | EN B1ab(iii,v)+2ab(iii,v) | 2015.1 | | Rhyssolobium dumosum E.Mey. | Threatened | Raimondo et al. (2009) | |
Bibliography |
Brown, N.E. 1909. Asclepiadeae. In: W.T. Thiselton-Dyer (ed). Flora Capensis IV Section I (Vacciniaceae to Gentianeae):518-1036. Lovell Reeve & Co., Ltd., London.
Raimondo, D., von Staden, L., Foden, W., Victor, J.E., Helme, N.A., Turner, R.C., Kamundi, D.A. and Manyama, P.A. 2009. Red List of South African Plants. Strelitzia 25. South African National Biodiversity Institute, Pretoria.
Snijman, D.A. 2013. Plants of the Greater Cape Floristic Region 2: The extra Cape flora. Strelitzia 30. South African National Biodiversity Institute, Pretoria.
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Citation |
| von Staden, L. & Van Wyk, P.C.V. 2015. Rhyssolobium dumosum E.Mey. National Assessment: Red List of South African Plants version . Accessed on 2025/05/12 |
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