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Scientific Name | Pleiospilos bolusii (Hook.f.) N.E.Br. |
Higher Classification | Dicotyledons |
Family | AIZOACEAE |
Synonyms | Mesembryanthemum bolusii Hook.f., Pleiospilos barbarae Karrer, Pleiospilos beaufortensis L.Bolus |
Common Names | Kwaggabal (a), Kwaggakos (a), Quagga (e), Quagga Kos (a) |
National Status |
Status and Criteria | Vulnerable B1ab(iii,v)+2ab(iii,v) |
Assessment Date | 2022/05/19 |
Assessor(s) | J.H. Vlok, D. Raimondo & S.J. Milton |
Justification | This species has a limited distribution range and has an extent of occurrence (EOO) of 6929 km ², and an area of occupancy (AOO) of 40 km². It is known from between five to eight locations. Its habitat quality and number of mature individuals are declining as a result of livestock (sheep and goat) overgrazing and illegal collection for the succulent plant trade. It is potentially threatened by prospecting for uranium mining at some locations. It is therefore listed as Vulnerable under criteria B1ab(iii,v)+2ab(iii,v). |
Distribution |
Endemism | South African endemic |
Provincial distribution | Eastern Cape, Western Cape |
Range | This species is endemic to South Africa, and is found from Beaufort West to Aberdeen and south of Willowmore. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Eastern Lower Karoo, Gamka Karoo |
Description | Plants occur in quartz flats in karroid shrubland. |
Threats |
| This species is threatened by overgrazing, trampling and succulent collecting. It also faces the potential threat of prospecting for uranium mining in some of its locations. |
Population |
There have been four collections made since 2007 and all of these record that the species occurs commonly with over 250 individuals recorded at one of the subpopulations. All other collections were made prior to 1937 and it is not know if these are still extant.
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Population trend | Decreasing |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Pleiospilos bolusii (Hook.f.) N.E.Br. | VU B1ab(iii,v) | Raimondo et al. (2009) | |
Bibliography |
Hartmann, H. and Liede, S. 1986. Die Gattung Pleiospilos s. lat. (Mesembryanthemaceae). Botanische Jahrbücher für Systematik 106(4):433-485.
Magee, A.R. and Boatwright, J.S. (eds). In prep. Plants of the Karoo: A Conspectus of the Nama-Karoo and Adjacent Summer-Rainfall Regions of the Northern and Western Cape Provinces. Strelitzia.
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.
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Citation |
| Vlok, J.H., Raimondo, D. & Milton, S.J. 2022. Pleiospilos bolusii (Hook.f.) N.E.Br. National Assessment: Red List of South African Plants version . Accessed on 2025/05/17 |
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