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Scientific Name | Aristea oligocephala Baker |
Higher Classification | Monocotyledons |
Family | IRIDACEAE |
National Status |
Status and Criteria | Near Threatened B1ab(iii)+2ab(iii) |
Assessment Date | 2021/05/26 |
Assessor(s) | H. Mtshali |
Justification | This species has a restricted distribution range, with an extent of occurrence (EOO) of 6 881 km², and an area of occupancy (AOO) of 232 km². It is still fairly common, occurring at many more than 10 locations, but a continuing decline is inferred from ongoing habit degradation due to the spread of alien invasive plants. Therefore it nearly meets the criteria thresholds for Vulnerable under criterion B and is listed as Near Threatened. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Western Cape |
Range | This species is restricted to southern Western Cape province of South Africa, where it occurs from the Hottentots Holland Mountains to Bredasdorp. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Overberg Sandstone Fynbos, Kogelberg Sandstone Fynbos |
Description | It grows on stony sandstone slopes and flats. |
Threats |
| About 40% of this species' habitat is already irreversibly modified, predominantly due to habitat loss from coastal development and agricultural expansion. No significant ongoing habitat loss was recorded since 1990, but ongoing degradation of habitat due to infrequent fires and alien plant invasion continues. |
Population |
Although this species has lost its habitat on the flats due to agriculture expansion and coastal development, it still persists on the sandstone slopes. The population trend is not known, but it is suspected to be declining.
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Population trend | Decreasing |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Aristea oligocephala Baker | Least Concern | Raimondo et al. (2009) | |
Bibliography |
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.
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 |
| Mtshali, H. 2021. Aristea oligocephala Baker. National Assessment: Red List of South African Plants version . Accessed on 2024/12/06 |
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