| Scientific Name | Disa sabulosa Bolus | Higher Classification | Monocotyledons | Family | ORCHIDACEAE | Synonyms | Monadenia sabulosa (Bolus) Kraenzl. |
National Status | Status and Criteria | Endangered B1ab(i,ii,iii,iv,v)+2ab(i,ii,iii,iv,v); C2a(ii) | Assessment Date | 2012/09/20 | Assessor(s) | H. Kurzweil, B. Bytebier, L. von Staden & I. Ebrahim | Justification | A single subpopulation of fewer than 1000 mature individuals, confined to an EOO of 6 km² and an estimated two to five locations continues to decline due to ongoing habitat loss to coastal development and competition from alien invasive plants. |
Distribution | Endemism | South African endemic | Provincial distribution | Western Cape | Range | Pringle Bay and Betty's Bay. |
Habitat and Ecology | Major system | Terrestrial | Major habitats | Hangklip Sand Fynbos | Description | Lower slopes and sandy flats, often in seasonally damp sand, 18-80 m. |
Threats | | Disa sabulosa is known from historical records to have occurred on the Cape Peninsula, but has not been recorded there in more than 45 years, despite the area being well surveyed, and is presumed extinct in this area due to urban expansion, alien plant invasion and inappropriate fire regimes. Currently, the species is known from a small area between Pringle Bay and Betty's Bay, where it is confined to lowland Hangklip Sand Fynbos, which is already 50% transformed due to ongoing expansion of coastal development. In addition, this species is also threatened by competition from alien invasive plants. |
Population | All recent collections (last 40 years or so) for Disa sabulosa are from between Pringle Bay and Betty's Bay, all the plants in this area should be considered a single subpopulation (B. Bytebier pers. comm. 2005). After a recent fire in 2008, between 350 and 500 plants were recorded in an area of about 60 hectares.
| Population trend | Decreasing |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Disa sabulosa Bolus | CR B1ab(i,ii,iii,iv,v)+2ab(i,ii,iii,iv,v) | 2012.1 | | Disa sabulosa Bolus | CR B1ab(i,ii,iii,iv,v)+2ab(i,ii,iii,iv,v) | Raimondo et al. (2009) | | Disa sabulosa Bolus | EN B1B2abcd | Victor (2002) | | Monadenia sabulosa (Bolus) Kraenzl. | Rare | Hilton-Taylor (1996) | | Monadenia sabulosa (Bolus) Kraenzl. | Rare | 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.
Liltved, W.R. and Johnson, S.D. Unpublished. The Cape Orchids - Wild orchids of the Cape Floral Kingdom.
Linder, H.P. 1981. Taxonomic studies in the Disinae. V. A revision of the genus Monadenia. Bothalia 13(3&4):339-363.
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 | | Kurzweil, H., Bytebier, B., von Staden, L. & Ebrahim, I. 2012. Disa sabulosa Bolus. National Assessment: Red List of South African Plants version . Accessed on 2025/04/14 |
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