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Scientific Name | Geissorhiza purpureolutea Baker |
Higher Classification | Monocotyledons |
Family | IRIDACEAE |
Synonyms | Geissorhiza sulphurea Schltr. (in part), Geissorhiza sulphurea Schltr. var. sulphurea |
National Status |
Status and Criteria | Near Threatened B1ab(ii,iii,v) |
Assessment Date | 2021/10/22 |
Assessor(s) | P. Goldblatt, R.C. Turner & T. Patel |
Justification | This species has an extent of occurrence (EOO) of 6353 km² and an area of occupancy (AOO) of 168 km². It is known from 26 extant locations after extensive past habitat loss to crop cultivation. Remaining subpopulations continue to decline due to urban expansion and encroachment from invasive alien vegetation. It is therefore listed as Near Threatened, almost meeting criteria B to be listed as Vulnerable. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Western Cape |
Range | An endemic restricted to the southwestern corner of Western Cape province, South Africa, extending from Piketberg south to Tulbagh and Paarl. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Swartland Shale Renosterveld, Breede Shale Renosterveld, Swartland Granite Renosterveld, Swartland Silcrete Renosterveld, Boland Granite Fynbos, Swartland Alluvium Fynbos |
Description | It occurs in wet, sandy gravel flats that are poorly drained. |
Threats |
| This species' lowland habitat is extensively transformed, mainly for crop cultivation. It has lost 80% of its habitat (calculated using landcover data in GIS). Plants are now confined to small fragments and continue to decline due to ongoing habitat loss primarily due to urban expansion and alien plant invasion. |
Population |
Subpopulations are generally small ranging from 50 to 250 plants, however a few large viable subpopulations occur. The population has a decreasing trend.
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Population trend | Decreasing |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Geissorhiza purpureolutea Baker | VU B1ab(ii,iii,iv,v) | 2012.1 | | Geissorhiza purpureolutea Baker | VU B1ab(ii,iii,iv,v) | Raimondo et al. (2009) | | Geissorhiza purpureolutea Baker | Insufficiently Known | 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. 2021. Geissorhiza purpureolutea Baker. National Assessment: Red List of South African Plants version . Accessed on 2024/09/15 |
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