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Scientific Name | Disa extinctoria Rchb.f. |
Higher Classification | Monocotyledons |
Family | ORCHIDACEAE |
National Status |
Status and Criteria | Near Threatened B1ab(iii,iv,v) |
Assessment Date | 2009/08/13 |
Assessor(s) | J.E. Victor, D. McMurtry, L. Grobler & S. Burns |
Justification | EOO < 16 000 km², suspected to occur at 10-15 locations. It has been collected numerous times but is rarely seen today, an indication that the population has declined. Loss has been the result of afforestation, urban expansion and alien plant invasion, decline is ongoing. |
Distribution |
Endemism | Not endemic to South Africa |
Provincial distribution | Limpopo, Mpumalanga |
Range | Swaziland to Tzaneen. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Grassland |
Description | Crest of the escarpment in damp grassland and swamps, 1000-1300 m. |
Threats |
| According to Doug McMurtry, this species only occurs in highly pristine wetlands (always found growing in association with Sphagnum spp. - a moss species used as indicator of undisturbed wetlands), and any disturbance to the wetland - drainage, eutrophication or invasive species, even trampling by cattle causes this species to disappear from the wetland.
Around Dullstroom the development of golf estates and trout dams have led to the disturbance of many wetlands (D. McMurtry pers. comm.). |
Population |
Population trend | Decreasing |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Disa extinctoria Rchb.f. | NT B1ab(iii,iv,v) | Raimondo et al. (2009) | | Disa extinctoria Rchb.f. | Lower Risk - Least Concern | Victor (2002) | | Disa extinctoria Rchb.f. | Rare | Hilton-Taylor (1996) | | Disa extinctoria Rchb.f. | Uncertain | Hall et al. (1980) | |
Bibliography |
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.
Linder, H.P. 1981. Taxonomic studies in the Disinae. III. A revision of Disa Berg. excluding sect. Micranthae Lindl. Contributions from the Bolus Herbarium 9:1-370.
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.
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Citation |
| Victor, J.E., McMurtry, D., Grobler, L. & Burns, S. 2009. Disa extinctoria Rchb.f. National Assessment: Red List of South African Plants version . Accessed on 2025/04/14 |
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