Taxonomy
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.
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.
Habitat and Ecology
Major system
Terrestrial
Major habitats
Amathole Montane Grassland
Description
It occurs in grassland on mountain slopes and summits.
Threats
Alien 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 ongoing habitat loss and degradation. Field surveys are needed to obtain better information on the population of this species.


Population trend
Decreasing
Assessment History
Taxon assessed
Status and Criteria
Citation/Red List version
Diascia ramosa Scott-ElliotVU D2Raimondo et al. (2009)
Diascia ramosa Scott-ElliotInsufficiently Known Hilton-Taylor (1996)
Diascia ramosa Scott-ElliotUncertain 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.


Citation
Raimondo, D., Dold, A.P. & Steiner, K.E. 2019. Diascia ramosa Scott-Elliot. 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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