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Scientific Name | Geissorhiza sulphurascens Schltr. ex R.C.Foster |
Higher Classification | Monocotyledons |
Family | IRIDACEAE |
National Status |
Status and Criteria | Vulnerable B1ab(i,ii,iii,iv,v)+2ab(i,ii,iii,iv,v) |
Assessment Date | 2023/06/19 |
Assessor(s) | D. Raimondo, N.A. Helme & R.C. Turner |
Justification | This species has an extent of occurrence (EOO) of 293 km² and an area of occupancy (AOO) of 64 km². It is known from nine extant locations. Its habitat is declining as a result of rooibos tea cultivation and it is therefore listed as Vulnerable under criterion B. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Northern Cape |
Range | It is endemic to Northern Cape province of South Africa, and is restricted to the Bokkeveld Mountains. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Bokkeveld Sandstone Fynbos |
Description | It occurs in poorly drained, seasonally wet, deep, sandstone-derived sands. |
Threats |
| This species has lost 37% of its habitat (calculated using landcover data in GIS). Expansion of rooibos tea cultivation has caused significant habitat loss since 2002, with one confirmed loss of a subpopulation on a farm near Nieuwoudtville to ploughing. This seasonally moist habitat specialist is also potentially sensitive to droughts as a result of climate change. |
Population |
The population has a decreasing trend and is known from nine extant subpopulations.
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Population trend | Decreasing |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Geissorhiza sulphurascens Schltr. ex R.C.Foster | VU 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 |
| Raimondo, D., Helme, N.A. & Turner, R.C. 2023. Geissorhiza sulphurascens Schltr. ex R.C.Foster. National Assessment: Red List of South African Plants version . Accessed on 2024/09/08 |
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