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Scientific Name | Diascia ramosa Scott-Elliot |
Higher Classification | Dicotyledons |
Family | SCROPHULARIACEAE |
National Status |
Status and Criteria | Critically Endangered B1ab(iii)+2ab(iii) |
Assessment Date | 2019/11/11 |
Assessor(s) | D. Raimondo, A.P. Dold & K.E. Steiner |
Justification | Diascia ramosa is known from a single location where it is threatened by competition from alien invasive plants. Its extent of occurrence (EOO) and area of occupancy (AOO) are both estimated to be smaller than 10 km². It is therefore listed as Critically Endangered under criterion B. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Eastern Cape |
Range | This species is endemic to the summit of the Boschberg near Somerset East in the Eastern Cape, South Africa. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Amathole Montane Grassland |
Description | It occurs in grassland on mountain slopes and summits. |
Threats |
| Diascia ramosa is under threat from alien invasive plants. Invasive plants are spreading across the southern slopes and summit of the Boschberg, and are outcompeting native species. |
Population |
This species is known from a single location, where it was last recorded in 1994. The current size and status of the population is not known, but it is assumed to be declining, due to ongoing habitat loss and degradation. Field surveys are needed to obtain better information on the population of this species.
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Population trend | Decreasing |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Diascia ramosa Scott-Elliot | CR B1ab(iii)+2ab(iii) | 2020.1 | | Diascia ramosa Scott-Elliot | VU D2 | Raimondo et al. (2009) | | Diascia ramosa Scott-Elliot | Insufficiently Known | Hilton-Taylor (1996) | | Diascia ramosa Scott-Elliot | Uncertain | Hall et al. (1980) | |
Bibliography |
Bredenkamp, C. In prep. Conspectus of the flora of the Eastern cape. Strelitzia.
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.
Hilliard, O.M. and Burtt, B.L. 1984. A revision of Diascia section Racemosae. Journal of South African Botany 50(3):269-340.
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.
Victor, J.E. and Dold, A.P. 2003. Threatened plants of the Albany Centre of Floristic Endemism, South Africa. South African Journal of Science 99:437-446.
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Citation |
| Raimondo, D., Dold, A.P. & Steiner, K.E. 2019. Diascia ramosa Scott-Elliot. National Assessment: Red List of South African Plants version . Accessed on 2025/04/14 |
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