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Scientific Name | Diosma awilana I.Williams |
Higher Classification | Dicotyledons |
Family | RUTACEAE |
National Status |
Status and Criteria | Endangered B1ab(i,ii,iii,v)+2ab(i,ii,iii,iv,v) |
Assessment Date | 2012/08/17 |
Assessor(s) | D. Raimondo, V. Zikishe & L. von Staden |
Justification | EOO 19 km², between two and five remaining locations continue to decline due to ongoing habitat loss and degradation as a result of alien plant invasion, and protea and other crop cultivation. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Western Cape |
Range | Baardskeerdersbos. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | De Hoop Limestone Fynbos, Agulhas Limestone Fynbos |
Description | Deep, sandy soil with little humus, associated with limestone, 45-61 m. |
Threats |
| This highly range-restricted species is threatened by competition from alien invasive plants over most of its range. On the western edge, plants are threatened by ongoing habitat loss to crop cultivation, as well as expanding protea cultivation for the cut flower industry, and overgrazing. |
Population |
Population trend | Decreasing |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Diosma awilana I.Williams | VU D2 | 2012.1 | | Diosma awilana I.Williams | VU D2 | Raimondo et al. (2009) | | Diosma awilana I.Williams | Lower Risk - Near Threatened | Victor (2002) | | Diosma awilana 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.
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. & von Staden, L. 2012. Diosma awilana I.Williams. National Assessment: Red List of South African Plants version . Accessed on 2025/04/14 |
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