Taxonomy
Scientific Name
Gladiolus stokoei G.J.Lewis
Higher Classification
Monocotyledons
Family
IRIDACEAE
National Status
Status and Criteria
Critically Endangered B1ab(iii,v)+2ab(iii,v)
Assessment Date
2017/04/26
Assessor(s)
L. von Staden & N.A. Helme
Justification
Gladiolus stokoei is a highly localized species, with an extent of occurrence (EOO) of 7 km². It is known from a single location where it is threatened by competition from spreading, unmanaged alien invasive plants.
Distribution
Endemism
South African endemic
Provincial distribution
Western Cape
Range
This species is endemic to the lower southern slopes of the Riviersonderend Mountains near Riviersonderend in the Western Cape.
Habitat and Ecology
Major system
Terrestrial
Major habitats
South Sonderend Sandstone Fynbos
Description
It is localized to marshy sandstone slopes.
Threats
Unmanaged alien invasive pines are spreading rapidly across this species' highly restricted range, and is likely to outcompete native species if not urgently cleared and managed. Hakea species are also present in places.
Population

This species is known from only a few records, and has been seldom recorded since it was first discovered in 1930. It flowers outside of the peak flowering season of the fynbos region, and may therefore be overlooked, but it appears to be endemic to the lower slopes of Pilaarkop in the Riviersonderend Mountains (Goldblatt and Manning 1998). After a recent fire, at least 400 flowering individuals were observed within an area of 1.4 km² (N.A. Helme pers. obs. 2016). The current population trend is not known, but this species is likely to decline if alien invasive pines are not cleared.


Population trend
Decreasing
Assessment History
Taxon assessed
Status and Criteria
Citation/Red List version
Gladiolus stokoei G.J.LewisCritically Rare Raimondo et al. (2009)
Gladiolus stokoei G.J.LewisRare Hilton-Taylor (1996)
Gladiolus stokoei G.J.LewisRare Hall et al. (1980)
Bibliography

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


Goldblatt, P. and Manning, J.C. 2000. Cape Plants: A conspectus of the Cape Flora of South Africa. Strelitzia 9. National Botanical Institute, Cape Town.


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.


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
von Staden, L. & Helme, N.A. 2017. Gladiolus stokoei G.J.Lewis. National Assessment: Red List of South African Plants version 2020.1. Accessed on 2020/11/24

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Distribution map


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