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Scientific Name | Geissorhiza spiralis (Burch.) M.P.de Vos ex Goldblatt |
Higher Classification | Monocotyledons |
Family | IRIDACEAE |
Synonyms | Romulea spiralis (Burch.) Baker |
National Status |
Status and Criteria | Vulnerable D2 |
Assessment Date | 2023/06/17 |
Assessor(s) | P. Goldblatt, L. von Staden & T. Patel |
Justification | This species has an extent of occurrence (EOO) of 536 km² and an area of occupancy (AOO) of 28 km². It is known from five locations. It is potentially threatened by habitat loss to crop cultivation and overgrazing and is therefore listed as Vulnerable under criterion D. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Northern Cape |
Range | It is endemic to South Africa, and occurs in the Roggeveld Escarpment around Sutherland in the Northern Cape. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Roggeveld Karoo, Roggeveld Shale Renosterveld |
Description | It grows on stony clay slopes in mountain renosterveld. |
Threats |
| This species has lost less than 2% of its habitat (calculated using landcover data in GIS) to crop fields in the past, but there has been no expansion of crop fields for over 24 years as the area is only marginally suited to crop cultivation. Large areas of the Roggeveld are severely overgrazed, and habitat degradation due to overgrazing is a potential threat. |
Population |
The population has a stable trend and is known from five subpopulations.
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Population trend | Stable |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Geissorhiza spiralis (Burch.) M.P.de Vos ex Goldblatt | VU D2 | Raimondo et al. (2009) | | Geissorhiza spiralis (Burch.) M.P.de Vos ex Goldblatt | 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.
Manning, J., Goldblatt, P. and Snijman, D. 2002. The color encyclopedia of Cape bulbs. Timber Press, Portland/Cambridge.
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.
Snijman, D.A. 2013. Plants of the Greater Cape Floristic Region 2: The extra Cape flora. Strelitzia 30. South African National Biodiversity Institute, Pretoria.
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Citation |
| Goldblatt, P., von Staden, L. & Patel, T. 2023. Geissorhiza spiralis (Burch.) M.P.de Vos ex Goldblatt. National Assessment: Red List of South African Plants version . Accessed on 2024/09/14 |
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