|
Scientific Name | Diosma parvula I.Williams |
Higher Classification | Dicotyledons |
Family | RUTACEAE |
National Status |
Status and Criteria | Endangered B1ab(iii,iv,v) |
Assessment Date | 2012/07/31 |
Assessor(s) | J.E. Victor, D. Raimondo & V. Zikishe |
Justification | EOO 3504 km², between three and four severely fragmented subpopulations continue to decline due to competition from alien invasive plants, habitat degradation in the form of grazing and trampling by game. The cultivation of proteas in the subpopulation near Agulhas poses a severe current threat. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Western Cape |
Range | Between Elim and Bredasdorp and on the plain south of Potberg. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Overberg Dune Strandveld, Overberg Sandstone Fynbos, Potberg Ferricrete Fynbos, Elim Ferricrete Fynbos, Albertinia Sand Fynbos, Agulhas Sand Fynbos |
Description | Dark sandy soil near seepage areas. |
Threats |
| Threatened by competition from unmanaged alien invasive plants across its range. Field observations in De Hoop Nature Reserve indicate decline due to overgrazing and trampling by game. At least one known subpopulation is threatened by habitat loss to protea cultivation for the cut-flower industry. |
Population |
A very rare and localized habitat specialist, known from only a few, isolated subpopulations.
|
Population trend | Decreasing |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Diosma parvula I.Williams | EN B1ab(iii,v)+2ab(iii,v) | Raimondo et al. (2009) | | Diosma parvula I.Williams | EN B1B2abcde | Victor (2002) | | Diosma parvula I.Williams | Endangered | 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. 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.
|
Citation |
| Victor, J.E., Raimondo, D. & Zikishe, V. 2012. Diosma parvula I.Williams. National Assessment: Red List of South African Plants version . Accessed on 2025/04/14 |
Comment on this assessment
