Taxonomy
Scientific Name
Disa introrsa Kurzweil, Liltved & H.P.Linder
Higher Classification
Monocotyledons
Family
ORCHIDACEAE
National Status
Status and Criteria
Vulnerable D2
Assessment Date
2017/04/13
Assessor(s)
L. von Staden, W.R. Liltved, E.G.H. Oliver & T.A. Oliver
Justification
A rare and localized habitat specialist (EOO <10 km²), known from two locations where it is potentially threatened by habitat loss to dam construction and agriculture.
Distribution
Endemism
South African endemic
Provincial distribution
Western Cape
Range
Southern Skurweberge in the Koue Bokkeveld.
Habitat and Ecology
Major system
Terrestrial
Major habitats
Winterhoek Sandstone Fynbos
Description
Mountain slopes, near running water, 1000-1190 m.
Threats
The small and localized population is potentially threatened by habitat loss to dam construction and expanding fruit orchards. There has been much recent expansion of agricultural development above Gydo Pass in recent years (N.A. Helme pers. comm.)
Population

There are two known subpopulations of this species, occurring about 5 km apart. Both subpopulations are very small, the largest consisting of 20-30 plants and the other <10 plants. This species is a fire ephemeral, flowering only in the first summer after fires, and therefore highly likely to be overlooked, and a confident estimate of the population size cannot be made at present.


Population trend
Stable
Assessment History
Taxon assessed
Status and Criteria
Citation/Red List version
Disa introrsa Kurzweil, Liltved & H.P.LinderRare Raimondo et al. (2009)
Disa introrsa Kurzweil, Liltved & H.P.LinderVU D2Victor (2002)
Disa introrsa Kurzweil, Liltved & H.P.LinderRare Hilton-Taylor (1997)
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. 1997. Red Data List of southern African plants. 2. Corrections and additions. Bothalia 27(2):195-209.


Kurzweil, H., Liltved, W.R. and Linder, H.P. 1997. Disa introrsa sp. nov. (Orchidaceae) from the Western Cape of South Africa, with notes on the phylogeny of Disa sect. Disella. Nordic Journal of Botany 17(4):353-260.


Liltved, W.R. and Johnson, S.D. Unpublished. The Cape Orchids - Wild orchids of the Cape Floral Kingdom.


Linder, H.P. and Kurzweil, H. 1999. Orchids of southern Africa. A.A. Balkema, Rotterdam.


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.


Citation
von Staden, L., Liltved, W.R., Oliver, E.G.H. & Oliver, T.A. 2017. Disa introrsa Kurzweil, Liltved & H.P.Linder. National Assessment: Red List of South African Plants version 2020.1. Accessed on 2020/08/10

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Distribution map


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