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Scientific Name | Oxalis duriuscula Schltr. |
Higher Classification | Dicotyledons |
Family | OXALIDACEAE |
National Status |
Status and Criteria | Endangered B2ab(ii,iii,iv,v) |
Assessment Date | 2020/02/12 |
Assessor(s) | N.A. Helme, D. Raimondo & L. von Staden |
Justification | Oxalis duriuscula is a range-restricted species with an extent of occurrence (EOO) of 5062 km². It has a severely fragmented population after more than 80% habitat loss to crop cultivation. It continues to decline due to ongoing habitat loss and degradation, and is therefore listed as Endangered under criterion B. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Western Cape |
Range | This species is endemic to South Africa, and is found in Overberg between Bot River, Heidelberg and Bredasdorp. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Eastern Ruens Shale Renosterveld, Central Ruens Shale Renosterveld, Western Ruens Shale Renosterveld, Ruens Silcrete Renosterveld, Greyton Shale Fynbos, Elim Ferricrete Fynbos |
Description | It occurs in renosterveld on sandy flats, 100-500 m. |
Threats |
| Oxalis duriuscula has lost more than 80% of its habitat to crop cultivation across the Overberg, and loss continues. Subpopulations persist on isolated renosterveld remnants, where they are threatened by competition from alien invasive plants, overgrazing and inappropriate fire management. |
Population |
This species remains on 12 isolated fragments, and subpopulations are small. Rapid, ongoing habitat loss has been recorded between 1990 and 2014, and recently part of one subpopulation was lost to urban expansion on the outskirts of Caledon.
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Population trend | Decreasing |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Oxalis duriuscula Schltr. | EN B2ab(ii,iii,iv,v) | 2020.1 | | Oxalis duriuscula Schltr. | NT B1ab(ii,iii,iv,v)+2ab(ii,iii,iv,v) | Raimondo et al. (2009) | | Oxalis duriuscula Schltr. | Insufficiently Known | Hilton-Taylor (1996) | | Oxalis duriuscula Schltr. | Uncertain | Hall et al. (1980) | |
Bibliography |
Goldblatt, P. and Manning, J.C. 2000. Cape Plants: A conspectus of the Cape Flora of South Africa. Strelitzia 9. National Botanical Institute, Cape Town.
Hall, A.V., De Winter, M., De Winter, B. and Van Oosterhout, S.A.M. 1980. Threatened plants of southern Africa. South African National Scienctific Programmes Report 45. CSIR, Pretoria.
Hilton-Taylor, C. 1996. Red data list of southern African plants. Strelitzia 4. South African National Botanical Institute, Pretoria.
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 |
| Helme, N.A., Raimondo, D. & von Staden, L. 2020. Oxalis duriuscula Schltr. National Assessment: Red List of South African Plants version . Accessed on 2025/04/14 |
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