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Scientific Name | Geissorhiza mathewsii L.Bolus |
Higher Classification | Monocotyledons |
Family | IRIDACEAE |
Common Names | Wine Cup (e) |
National Status |
Status and Criteria | Endangered B1ab(iii,v)+2ab(iii,v) |
Assessment Date | 2021/10/19 |
Assessor(s) | P. Goldblatt, R.C. Turner & D. Raimondo |
Justification | This species has an extent of occurrence (EOO) of between 180-230 km² and an area of occupancy (AOO) of 20-28 km². Between four and five isolated subpopulations remain after extensive habitat loss to wheat and pasture cultivation. It continues to decline due to ongoing habitat loss and degradation, as well as competition from dense alien invasive annual grasses and wattle infestations of its wetland habitat. It is therefore listed as Endangered under criteria B. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Western Cape |
Range | It is endemic to Western Cape, South Africa, occurring in Darling and Malmesbury. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Swartland Granite Renosterveld, Atlantis Sand Fynbos |
Description | It occurs in seasonally wet, sandy flats, moist clay soils, and waterlogged soil. |
Threats |
| This species has lost 68% of its habitat (calculated using landcover data in GIS) to crop cultivation and only small, isolated fragments of natural vegetation remain. Plants are surviving on remnants that continue to decline due to ongoing habitat loss for crop cultivation and severe overgrazing and competition from alien invasive plants. |
Population |
The population has a decreasing trend and is known from four to five subpopulations, the one uncertain subpopulation was recorded in 1992 from the Dassenberg area and since there is still suitable habitat in this area, it is likely that it is still extant. The size of the subpopulations is unknown but one has been recorded to be large.
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Population trend | Decreasing |
Notes |
| This species is related to, and often confused with Geissorhiza eurystigma. |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Geissorhiza mathewsii L.Bolus | CR B1ab(ii,iii,v)+2ab(ii,iii,v) | Raimondo et al. (2009) | | Geissorhiza mathewsii L.Bolus | Vulnerable | Hilton-Taylor (1996) | | Geissorhiza mathewsii L.Bolus | Vulnerable | Hall et al. (1980) | |
Bibliography |
Duncan, G. 2002. Just holding on: spectacular geophytes in peril. Veld & Flora 88(4):142-147.
Goldblatt, P. 1985. Systematics of the southern African genus Geissorhiza (Iridaceae-Ixioideae). Annals of the Missouri Botanical Garden 72(2):277-447.
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.
Goldblatt, P. and Manning, J.C. 2020. Iridaceae of southern Africa. Strelitzia 42. South African National Biodiversity Institute, Pretoria.
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.
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.
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Citation |
| Goldblatt, P., Turner, R.C. & Raimondo, D. 2021. Geissorhiza mathewsii L.Bolus. National Assessment: Red List of South African Plants version . Accessed on 2024/09/08 |
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