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Scientific Name | Geissorhiza barkerae Goldblatt |
Higher Classification | Monocotyledons |
Family | IRIDACEAE |
National Status |
Status and Criteria | Endangered B1ab(ii,iii,iv,v)+2ab(ii,iii,iv,v) |
Assessment Date | 2021/10/11 |
Assessor(s) | N.A. Helme & T. Patel |
Justification | This species has an extent of occurrence (EOO) of 330 km², and an area of occupancy (AOO) of 36 km². It is known from five threat base locations and the population is declining due to habitat loss to the cultivation of wheat, rooibos tea and potatoes. It is therefore listed as Endangered under criterion B. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Western Cape |
Range | An endemic to the Piketberg area of Western Cape province, South Africa, where it occurs on the lower slopes and flats east and west of the range and on the lower slopes of the Olifants River Mountains. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Swartland Shale Renosterveld, Leipoldtville Sand Fynbos |
Description | It occurs on seasonally wet to marshy flats, mainly on sandy ground. |
Threats |
| It has lost 76% of its habitat (calculated using landcover data in GIS). It is threatened by ongoing habitat loss to expanding cultivation of wheat, rooibos tea and potatoes. |
Population |
The population has a decreasing trend, and is known from five subpopulations.
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Population trend | Decreasing |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Geissorhiza barkerae Goldblatt | EN B1ab(ii,iii,iv,v) | Raimondo et al. (2009) | |
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.
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 |
| Helme, N.A. & Patel, T. 2021. Geissorhiza barkerae Goldblatt. National Assessment: Red List of South African Plants version . Accessed on 2024/09/14 |
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