Erica trichostigma

Taxonomy
Scientific Name
Erica trichostigma Salter
Higher Classification
Dicotyledons
Family
ERICACEAE
National Status
Status and Criteria
Critically Endangered B2ab(i,ii,iii,iv,v)
Assessment Date
2016/02/05
Assessor(s)
N.A. Helme & L. von Staden
Justification
EOO 100-200 km², AOO <10 km², one, possibly two remaining subpopulations are threatened by habitat loss to development and competition from alien invasive plants.
Distribution
Endemism
South African endemic
Provincial distribution
Western Cape
Range
Langebaan to Mamre.
Habitat and Ecology
Major system
Terrestrial
Major habitats
Saldanha Granite Strandveld, Atlantis Sand Fynbos
Description
Loamy sands over granite on coastal flats.
Threats
There is ongoing development in the area surrounding the only known surviving subpopulation on the outskirts of Langebaan, which is endangering many local granite endemics. The subpopulation occurs on a site adjacent to the local landfill, but is currently only used for light grazing, and there are only minor infestations of alien invasive plants (N.A. Helme pers. obs. 2015). Habitat loss to development however remains a potential future threat. Competition from alien invasive plants is also likely to become a threat in future if current infestations are not controlled. Around Mamre, alien invasive plant infestations are severe, outcompeting native species, and is likely to threaten any surviving subpopulations in this area. There is also ongoing habitat loss to urban expansion to around Atlantis. One historical record suggests that this species occurs about 3 km south of Mamre, in which case it is likely to be locally extinct due to habitat loss to urban expansion.
Population

This species is known historically from only two locations: granite outcrops to the north-east of Langebaan on the Cape West Coast, where it was first discovered in 1935, and last recorded in 1985, until a surviving subpopulation was found in this area in 2015 (N.A. Helme pers. comm. 2015). This subpopulation is not currently threatened. There are also a number of collections from the vicinity of Mamre, about 60 km further south, where it was last seen in 1967. It is possibly already locally extinct in this area, as it has not yet been found again despite intensive surveys for rare and threatened plants around Mamre.


Population trend
Decreasing
Assessment History
Taxon assessed
Status and Criteria
Citation/Red List version
Erica trichostigma SalterVU B1ab(ii,iii,iv,v)+2ab(ii,iii,iv,v)Raimondo et al. (2009)
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.


Manning, J.C. and Goldblatt, P. 2012. Plants of the Greater Cape Floristic Region 1: The Core Cape Flora. Strelitzia 29. South African National Biodiversity 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.


Schumann, D., Kirsten, G. and Oliver, E.G.H. 1992. Ericas of South Africa. Fernwood Press, Cape Town.


Citation
Helme, N.A. & von Staden, L. 2016. Erica trichostigma Salter. National Assessment: Red List of South African Plants version 2017.1. Accessed on 2017/09/19

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Distribution map

© N.A. Helme


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