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Scientific Name | Diosma arenicola I.Williams |
Higher Classification | Dicotyledons |
Family | RUTACEAE |
National Status |
Status and Criteria | Vulnerable B1ab(ii,iii,iv,v)+2ab(ii,iii,iv,v) |
Assessment Date | 2012/08/15 |
Assessor(s) | D. Raimondo, N.A. Helme & V. Zikishe |
Justification | EOO 938 km², plants at between six and eight remaining locations continue to decline due to competition from alien invasive plants and habitat loss to coastal development and agricultural expansion. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Western Cape |
Range | Bredasdorp to Hagelkraal. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Overberg Sandstone Fynbos, De Hoop Limestone Fynbos, Agulhas Limestone Fynbos |
Description | Sandy soil closely associated with limestone deposits, often in seepage areas. |
Threats |
| Subpopulations at Groot Hagelkraal, the Soetanysberg section of Agulhas National Park, and Brandfontein Private Nature Reserve are currently well protected, although ongoing clearing and management of alien invasive plants is required to prevent these subpopulations from declining further. Coastal and inland subpopulations continue to decline to coastal development, protea cultivation, alien infestation and urban expansion. |
Population |
What was one large subpopulation between Agulhas and Struisbaai in the past has now been fragmented by habitat loss to coastal development, and continue to decline due to ongoing habitat loss. This species is also known from historical records from around the town of Bredasdorp, but due to much habitat loss and degradation, it is uncertain whether any subpopulations survive.
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Population trend | Decreasing |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Diosma arenicola I.Williams | EN B1ab(iii)+2ab(iii) | 2012.1 | | Diosma arenicola I.Williams | EN B1ab(iii)+2ab(iii) | Raimondo et al. (2009) | | Diosma arenicola I.Williams | Lower Risk - Near Threatened | Victor (2002) | | Diosma arenicola I.Williams | Insufficiently Known | Hilton-Taylor (1996) | |
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.
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.
Victor, J.E. 2002. South Africa. In: J.S. Golding (ed), Southern African plant Red Data Lists. Southern African Botanical Diversity Network Report 14 (pp. 93-120), SABONET, Pretoria.
Williams, I. 1979. Studies in the genera of the Diosmeae (Rutaceae): 8. Journal of South African Botany 45(2):147-184.
Williams, I. 1982. Studies in the genera of the Diosmeae (Rutaceae): 14. A review of the genus Diosma L. Journal of South African Botany 48(3):329-407.
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Citation |
| Raimondo, D., Helme, N.A. & Zikishe, V. 2012. Diosma arenicola I.Williams. National Assessment: Red List of South African Plants version . Accessed on 2025/04/14 |
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