Taxonomy
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
2012/08/20
Assessor(s)
D. Raimondo, J.H. Vlok & S.L. Hutchinson
Justification
EOO 632 km² and AOO <632 km², between six and seven locations remain. Located on small fragments, this species 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
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
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
Protected in the Bontebok National Park.
Assessment History
Taxon assessed
Status and Criteria
Citation/Red List version
Acmadenia laxa I.WilliamsEN B1ab(iii)+2ab(iii)2012.1
Acmadenia laxa I.WilliamsEN B1ab(iii)+2ab(iii)Raimondo et al. (2009)
Acmadenia laxa I.WilliamsVU D2Victor (2002)
Acmadenia laxa I.WilliamsVulnerable 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.


Citation
Raimondo, D., Vlok, J.H. & Hutchinson, S.L. 2012. Acmadenia laxa I.Williams. National Assessment: Red List of South African Plants version 2020.1. Accessed on 2021/09/19

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Distribution map

© N.A. Helme

© C. Paterson-Jones


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