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Scientific Name | Diosma tenella I.Williams |
Higher Classification | Dicotyledons |
Family | RUTACEAE |
National Status |
Status and Criteria | Endangered B1ab(i,ii,iii,iv,v) |
Assessment Date | 2013/02/21 |
Assessor(s) | D. Raimondo & V. Zikishe |
Justification | EOO 4239 km², between five and seven severely fragmented subpopulations remain. There is an ongoing decline due to Invasive alien plants, agricultural expansion and infrastructure development. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Western Cape |
Range | De Hoop and Langeberg between Heidelberg and Albertinia. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Ruens Silcrete Renosterveld, De Hoop Limestone Fynbos, Garden Route Shale Fynbos, Potberg Ferricrete Fynbos, Elim Ferricrete Fynbos, Swellendam Silcrete Fynbos, Central Coastal Shale Band Vegetation, Hartenbos Dune Thicket |
Description | Sandy soils associated with a variety of formations including Bokkeveld shale, ferricrete, silcrete and gravels. |
Threats |
| Most of this species' habitat has been lost to crop cultivation, and only small fragments remain, which continues to be degraded due to overgrazing, a lack of fire and alien plant invasion. Subpopulations near the coast are threatened by dense, spreading alien plant invasions. Subpopulations near Riversdale are threatened by urban expansion. |
Population |
Population trend | Decreasing |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Diosma tenella I.Williams | VU B1ab(ii,iii,iv,v) | 2012.1 | | Diosma tenella I.Williams | VU B1ab(ii,iii,iv,v) | Raimondo et al. (2009) | | Diosma tenella I.Williams | Lower Risk - Near Threatened | Victor (2002) | | Diosma tenella I.Williams | Rare | 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.
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Citation |
| Raimondo, D. & Zikishe, V. 2013. Diosma tenella I.Williams. National Assessment: Red List of South African Plants version . Accessed on 2025/04/14 |
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