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Scientific Name | Diosma fallax I.Williams |
Higher Classification | Dicotyledons |
Family | RUTACEAE |
National Status |
Status and Criteria | Endangered A2c |
Assessment Date | 2015/02/24 |
Assessor(s) | J.H. Vlok, D. Raimondo, V. Zikishe & L. von Staden |
Justification | A population reduction of at least 50% is estimated based on 59% of habitat loss over 150 years (within three generations of this long-lived resprouter). Two subpopulations remain, one in the Bontebok National Park, and a second, smaller one is on a nearby farm. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Western Cape |
Range | Bontebok Park. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Eastern Ruens Shale Renosterveld, Central Ruens Shale Renosterveld, Swellendam Silcrete Fynbos, Cape Lowland Alluvial Vegetation |
Description | Bokkeveld shale in renosterveld. |
Threats |
| Crop cultivation was a severe past threat to this species. All known locations outside the Bontebok National Park have been lost wheat cultivation. It was also declining due to overgrazing in the past, when the Bontebok Park was managed only for Bontebok survival and much of the land was overstocked. Managers of the park are however now aware of rare and threatened plant species occurring in the reserve and are implementing management regimes that will ensure the survival of this subpopulation. |
Population |
Population trend | Stable |
Conservation |
| Protected in the Bontebok National Park. |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Diosma fallax I.Williams | EN A2bc | Raimondo et al. (2009) | | Diosma fallax I.Williams | VU D2 | Victor (2002) | | Diosma fallax I.Williams | Extinct | 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.
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Citation |
| Vlok, J.H., Raimondo, D., Zikishe, V. & von Staden, L. 2015. Diosma fallax I.Williams. National Assessment: Red List of South African Plants version . Accessed on 2025/04/14 |
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