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Scientific Name | Diosma demissa I.Williams |
Higher Classification | Dicotyledons |
Family | RUTACEAE |
National Status |
Status and Criteria | Vulnerable B1ab(i,ii,iii,iv,v)+2ab(i,ii,iii,iv,v) |
Assessment Date | 2012/07/26 |
Assessor(s) | D. Raimondo & V. Zikishe |
Justification | EOO 573 km², between five and nine locations remain in two disjunct areas. The subpopulation on the Cape Peninsula is protected and not threatened, but between Die Kelders and Pearly Beach subpopulations are declining due to ongoing habitat loss to coastal development and competition from alien invasive plants. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Western Cape |
Range | Cape Peninsula and Stanford to Hagelkraal. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Overberg Dune Strandveld, Cape Flats Dune Strandveld |
Description | Small sandy pockets in the tertiary limestone which overlies sandstones along coastal cliffs. |
Threats |
| Habitat loss to coastal development is currently the most serious threat to this species, particularly between De Kelders and Pearly Beach. Most subpopulations between Stanford and Hagelkraal are also threatened by competition from alien invasive plants. The subpopulation on the Cape Peninsula is within a protected area and is not threatened. |
Population |
Population trend | Decreasing |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Diosma demissa I.Williams | VU B1ab(ii,iii,iv,v)+2ab(ii,iii,iv,v) | Raimondo et al. (2009) | | Diosma demissa I.Williams | Lower Risk - Least Concern | Victor (2002) | | Diosma demissa 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. 1975. Studies in the genera of the Diosmeae (Rutaceae): 6. Journal of South African Botany 41(4):239-268.
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. & Zikishe, V. 2012. Diosma demissa I.Williams. National Assessment: Red List of South African Plants version . Accessed on 2025/04/14 |
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