Hexacyrtis dickiana

Taxonomy
Scientific Name
Hexacyrtis dickiana Dinter
Higher Classification
Monocotyledons
Family
COLCHICACEAE
National Status
Status and Criteria
Endangered* B1ab(iii,v)+2ab(iii,v)
Assessment Date
2015/05/14
Assessor(s)
D. Raimondo & P.C.V. Van Wyk
Justification
Plants at one known location in South Africa are declining due to ongoing habitat degradation as a result of overgrazing and mining. This taxon therefore qualifies for Critically Endangered under Criterion B, however it is widespread and not threatened in Namibia, the national status is downgraded by one category following IUCN regional assessment procedures.
Distribution
Endemism
Not endemic to South Africa
Provincial distribution
Northern Cape
Range
Swakopmund to the lower Gariep Valley inland of Alexander Bay.
Habitat and Ecology
Major system
Terrestrial
Major habitats
Western Gariep Lowland Desert
Description
Coastal dunes and inland sand plumes.
Threats
Threatened in South Africa by habitat degradation due to overgrazing. The only known subpopulation in South Africa is in an area that is severely overstocked with livestock, with stocking rates nearly doubling in the past five years. It is also adjacent to an open-cast mine, which is leading to widespread disturbance as a result of dust blowing from exposed mine dumps over the surrounding plains. In Namibia, it is also threatened by habitat loss to mining along the coast north of the Orange River, but most subpopulations in Namibia are not threatened.
Population

There is only one subpopulation of this species in South Africa, which is declining due to ongoing habitat degradation. The South African subpopulation is however continuous with the much larger Namibian population that is not declining, and is likely to benefit from rescue effects.


Population trend
Decreasing
Assessment History
Taxon assessed
Status and Criteria
Citation/Red List version
Hexacyrtis dickiana DinterEN* B1ab(iii,v)+2ab(iii,v)2015.1
Hexacyrtis dickiana DinterLeast Concern Raimondo et al. (2009)
Hexacyrtis dickiana DinterNot Threatened Hilton-Taylor (1996)
Bibliography

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.


Snijman, D.A. 2013. Plants of the Greater Cape Floristic Region 2: The extra Cape flora. Strelitzia 30. South African National Biodiversity Institute, Pretoria.


Citation
Raimondo, D. & Van Wyk, P.C.V. 2015. Hexacyrtis dickiana Dinter. National Assessment: Red List of South African Plants version 2017.1. Accessed on 2018/11/16

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Distribution map


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