Taxonomy
Scientific Name
Syringodea derustensis M.P.de Vos
Higher Classification
Monocotyledons
Family
IRIDACEAE
National Status
Status and Criteria
Vulnerable B1ab(ii,iii,iv,v)+2ab(ii,iii,iv,v)
Assessment Date
2020/01/17
Assessor(s)
J.H. Vlok & D. Raimondo
Justification
A range-restricted species (EOO 592 km²) known from less than 10 locations. It has experienced past loss to urban expansion and crop cultivation around De Rust and to dam construction in Dysselsdorp. Decline is ongoing due to informal housing expansion around De Rust. This species is also potentially threatened by ostrich farming.
Distribution
Endemism
South African endemic
Provincial distribution
Western Cape
Range
This species is endemic to the Western Cape Province, South Africa, where it occurs from Oudtshoorn to De Rust.
Habitat and Ecology
Major system
Terrestrial
Major habitats
Mons Ruber Fynbos Thicket, Gamka Valley Thicket, Oudshoorn Karroid Thicket, Muscadel Riviere
Description
Stony hills in succulent karoo vegetation.
Threats
Major populations around De Rust were exterminated by urban and agricultural developments in the past, it also lost habitat and a subpopulation to Dam building in Dysselsdorp. Subpopulations around De Rust are still declining as the commonage is not well managed and part of the land has recently been lost through (illegal) informal housing. (J. Vlok 2008 pers. comm.) The other populations on private land are potentially threatened by the ostrich industry.
Population
Population trend
Decreasing
Assessment History
Taxon assessed
Status and Criteria
Citation/Red List version
Syringodea derustensis M.P.de VosVU B1ab(ii,iii,iv,v)Raimondo et al. (2009)
Syringodea derustensis M.P.de VosVulnerable Hilton-Taylor (1996)
Syringodea derustensis M.P.de VosRare Hall et al. (1980)
Bibliography

De Vos, M.P. 1983. Syringodea, Romulea. In: O.A. Leistner (ed). Flora of Southern Africa 7 Iridaceae, Part 2 Ixioideae, Fascicle 2:1-73. Botanical Research Institute, Pretoria.


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.


Hall, A.V., De Winter, M., De Winter, B. and Van Oosterhout, S.A.M. 1980. Threatened plants of southern Africa. South African National Scienctific Programmes Report 45. CSIR, Pretoria.


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.


Vlok, J. and Schutte-Vlok, A.L. 2010. Plants of the Klein Karoo. Umdaus Press, Hatfield.


Citation
Vlok, J.H. & Raimondo, D. 2020. Syringodea derustensis M.P.de Vos. National Assessment: Red List of South African Plants version 2020.1. Accessed on 2022/05/20

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Distribution map

© D. Turner

© J.H. Vlok/A.L. Schutte-Vlok


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