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Scientific Name | Geissorhiza louisabolusiae R.C.Foster |
Higher Classification | Monocotyledons |
Family | IRIDACEAE |
Synonyms | Geissorhiza louisabolusiae R.C.Foster var. longifolia R.C.Foster |
National Status |
Status and Criteria | Endangered B1ab(i,ii,iii,iv,v)+2ab(i,ii,iii,iv,v) |
Assessment Date | 2023/06/06 |
Assessor(s) | P. Goldblatt, R.C. Turner & T. Patel |
Justification | The species has an extent of occurrence (EOO) of 1883 km² and an area of occupancy (AOO) of 36 km². The population is known to exist in between three and five extant locations and is experiencing a decline due to severe ongoing habitat loss caused by citrus cultivation at Citrusdal and in the Koue Bokkeveld. Therefore, it is listed as Endangered under criteria B. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Western Cape |
Range | An endemic to the Western Cape province of South Africa, that is found in the Olifants River Valley and the Koue Bokkeveld. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Citrusdal Shale Renosterveld, Kouebokkeveld Shale Fynbos, Kouebokkeveld Alluvium Fynbos |
Description | It occurs in seasonally wet, often waterlogged sandy flats and vleis or shallow marshy sites. |
Threats |
| The species has lost 24% of its habitat (calculated using landcover data in GIS) primarily due to the cultivation of citrus, vineyards, and vegetables. Ongoing crop cultivation remains a threat. Additionally, past habitat loss has occurred due to urban development in Citrusdal. Alien invasive plants are spreading, and without proper management, they are likely to outcompete native species. |
Population |
The population has a decreasing trend and is known from between three and five extant subpopulations. More than half of the historic records for this species are from subpopulations that have been lost to crop cultivation.
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Population trend | Decreasing |
Conservation |
| It is not currently conserved in any formally protected area. |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Geissorhiza louisabolusiae R.C.Foster | EN B1ab(ii,iii,v) | Raimondo et al. (2009) | | Geissorhiza louisabolusiae R.C.Foster | Endangered | Hilton-Taylor (1996) | |
Bibliography |
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.
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. & Patel, T. 2023. Geissorhiza louisabolusiae R.C.Foster. National Assessment: Red List of South African Plants version . Accessed on 2024/09/14 |
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