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Scientific Name | Geissorhiza namaquensis W.F.Barker |
Higher Classification | Monocotyledons |
Family | IRIDACEAE |
National Status |
Status and Criteria | Least Concern |
Assessment Date | 2021/10/20 |
Assessor(s) | D. Raimondo, P. Goldblatt, N.A. Helme & T. Patel |
Justification | A restricted range endemic with an extent of occurrence (EOO) of 5833 km² and an area of occupancy (AOO) of 40 km². It is known from seven subpopulations but a few more are likely to occur. It is not threatened and is therefore listed as Least Concern. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Northern Cape |
Range | An endemic to the Northern Cape Province of South Africa, extending from the southern Richtersveld to the Spektakel mountains west of Springbok and on the escarpment west of Kamieskroon in central Namaqualand. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Kamiesberg Mountains Shrubland, Namaqualand Shale Shrubland, Namaqualand Granite Renosterveld, Kamiesberg Granite Fynbos |
Description | It occurs in mountain renosterveld, on granitic soil at the Kamiesberg but elsewhere is restricted to shale and quartzite outcrops of the Nama System. |
Threats |
| This species has lost 4% of its habitat (calculated using landcover data in GIS) to agricultural expansion in some areas. Overgrazing may affect some subpopulations. However, the population is not in danger of extinction. |
Population |
It has a stable population trend and is known from seven subpopulations with a few more as yet undiscovered subpopulations likely to exist.
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Population trend | Stable |
Conservation |
| It occurs in the Skilpad Wildflower Reserve, but otherwise is not conserved. |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Geissorhiza namaquensis W.F.Barker | Rare | Raimondo et al. (2009) | | Geissorhiza namaquensis W.F.Barker | Rare | 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. 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 |
| Raimondo, D., Goldblatt, P., Helme, N.A. & Patel, T. 2021. Geissorhiza namaquensis W.F.Barker. National Assessment: Red List of South African Plants version . Accessed on 2024/09/08 |
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