Taxonomy
Scientific Name
Gladiolus robertsoniae F.Bolus
Higher Classification
Monocotyledons
Family
IRIDACEAE
National Status
Status and Criteria
Near Threatened B1ab(iii)
Assessment Date
2013/01/17
Assessor(s)
M. Lötter, J.E. Burrows, L. von Staden & D. Raimondo
Justification
EOO 12 783 km², between 10 and 20 locations continue to decline due to ongoing habitat degradation as a result of mining and overgrazing by livestock. Subpopulations are large and not severely fragmented.
Distribution
Endemism
South African endemic
Provincial distribution
Free State, Gauteng, Mpumalanga
Range
South-eastern Gauteng, northern Free State and south-western Mpumalanga.
Habitat and Ecology
Major system
Terrestrial
Major habitats
Grassland
Description
Moist highveld grasslands, found in wet, rocky sites, mostly dolerite outcrops, wedged in rock crevices.
Threats
Landuse within the known range of this species is predominantly agriculture, and about 39% of grasslands within the range are transformed. However, agriculture is unlikely to have affected this species severely as moist rocky areas are unsuitable for ploughing and crop cultivation. Parts of the range, for example around Secunda between Nigel and Bethal are intensively mined, especially for coal. There has been renewed interest in coal mining, and many applications for coal mining in southern Mpumalanga have been submitted in the last five years (M. Lötter pers. comm.). Coal mining is very disruptive to the environment, and impacts on drainage systems can be severe, reaching far beyond the boundaries of the mining through the disruption of water flow and pollution. Overgrazing and trampling of the moist habitat by cattle have been reported in the Amersfoort area. Ongoing pressures on the habitat is leading to a decline in the quality of habitat which may eventually lead a decline in the population. Subpopulations within Gauteng have declined in the past due to urban expansion.
Population
Population trend
Decreasing
Assessment History
Taxon assessed
Status and Criteria
Citation/Red List version
Gladiolus robertsoniae F.BolusNT B1ab(iii)Raimondo et al. (2009)
Gladiolus robertsoniae F.BolusNear Threatened Pfab and Victor (2002)
Gladiolus robertsoniae F.BolusRare Hilton-Taylor (1996)
Gladiolus robertsoniae F.BolusRare Hall et al. (1980)
Bibliography

Goldblatt, P. and Manning, J.C. 1998. Gladiolus in southern Africa. Fernwood Press, Vlaeberg.


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.


Lewis, G.J., Obermeyer, A.A. and Barnard, T.T. 1972. Gladiolus: a revision of the South African species. Journal of South African Botany Supplement 10:1-316. Purnell, Cape Town.


Pfab, M.F. and Victor, J.E. 2002. Threatened plants of Gauteng, South Africa. South African Journal of Botany 68:370-375.


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.


Citation
Lötter, M., Burrows, J.E., von Staden, L. & Raimondo, D. 2013. Gladiolus robertsoniae F.Bolus. National Assessment: Red List of South African Plants version 2020.1. Accessed on 2021/09/26

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Distribution map

© T. de Castro

© T. de Castro

© T. de Castro


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