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Scientific Name | Acmadenia laxa I.Williams |
Higher Classification | Dicotyledons |
Family | RUTACEAE |
National Status |
Status and Criteria | Vulnerable B1ab(ii,iii,iv,v)+2ab(ii,iii,iv,v) |
Assessment Date | 2023/02/27 |
Assessor(s) | D. Raimondo, J.H. Vlok & S.L. Hutchinson |
Justification | This species has an extent of occurrence (EOO) of 632 km² and an area of occupancy (AOO) of less than 632 km². It is known from between six and seven locations. It is located on small fragments and is declining due to urban development around Swellendam, expanding crop cultivation on the lowlands below the Langeberg and competition from alien invasive plants. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Western Cape |
Range | It is found at the foot of the Langeberg Mountains around Swellendam, and southwards towards Haarwegskloof. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Eastern Ruens Shale Renosterveld, Swellendam Silcrete Fynbos |
Description | It occurs in dry rocky ground, 100-300 m. |
Threats |
| This species has already lost the majority of its habitat to crop cultivation, and only small remnants remain. Alien invasive plants (mainly pine, wattle and hakea) are causing subpopulations to decline at most locations and transformation of remaining fragments for agriculture and housing developments are ongoing threats. |
Population |
Population trend | Decreasing |
Conservation |
| It is protected in the Bontebok National Park. |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Acmadenia laxa I.Williams | EN B1ab(iii)+2ab(iii) | 2012.1 | | Acmadenia laxa I.Williams | EN B1ab(iii)+2ab(iii) | Raimondo et al. (2009) | | Acmadenia laxa I.Williams | VU D2 | Victor (2002) | | Acmadenia laxa I.Williams | Vulnerable | 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.
McDonald, D.J. 2000. Floral secrets of the Bontebok National Park. Veld & Flora 86:70-72.
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): 13. A revision of the genus Acmadenia. Journal of South African Botany 48(2):169-240.
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Citation |
| Raimondo, D., Vlok, J.H. & Hutchinson, S.L. 2023. Acmadenia laxa I.Williams. National Assessment: Red List of South African Plants version . Accessed on 2025/04/14 |
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