Taxonomy
Scientific Name
Acmadenia rupicola I.Williams
Higher Classification
Dicotyledons
Family
RUTACEAE
National Status
Status and Criteria
Vulnerable D2
Assessment Date
2012/08/07
Assessor(s)
J.E. Victor, D. Raimondo, J.H. Vlok & S.L. Hutchinson
Justification
Recorded from one, possibly two locations, where the subpopulation numbers ± 2000 individuals and EOO and AOO <5 km². This species is potentially threatened by alien invasive plants and too frequent fires as it is a slow growing reseeder.
Distribution
Endemism
South African endemic
Provincial distribution
Western Cape
Range
Outeniqua Mountains, Robinson's Pass.
Habitat and Ecology
Major system
Terrestrial
Major habitats
South Outeniqua Sandstone Fynbos
Description
Rocky sandstone outcrops on slopes in montane fynbos, 850 m.
Threats
This slow-growing reseeder is suspected to be very sensitive to fire, as it occurs in a fire refuge habitat. A severe fire in 2001 caused an apparent extensive population reduction, but it appears to have recovered. Too frequent fire is still considered a potential threat, as well as the spread of alien invasive plants.
Population

The population appears to fluctuate in response to fire. Before a large fire in 2001, there were between 500 and 1000 plants, but after the fire less than 100 seedlings could be found (J. Vlok pers. obs.). A recount of the population in 2011 found ± 2000 individuals.


Population trend
Fluctuating
Conservation
Part of the population is protected in Ruitersbos Nature Reserve.
Assessment History
Taxon assessed
Status and Criteria
Citation/Red List version
Acmadenia rupicola I.WilliamsCR A2aRaimondo et al. (2009)
Acmadenia rupicola I.WilliamsVU D2Victor (2002)
Acmadenia rupicola 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.


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. 1979. Studies in the genera of the Diosmeae (Rutaceae): 8. Journal of South African Botany 45(2):147-184.


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

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Distribution map

© A. van Zuydam

© J.E. Victor

© J.E. Victor

© Outramps

© I. Ebrahim


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