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Scientific Name | Geissorhiza brevituba (G.J.Lewis) Goldblatt |
Higher Classification | Monocotyledons |
Family | IRIDACEAE |
Synonyms | Engysiphon brevitubus G.J.Lewis |
National Status |
Status and Criteria | Vulnerable D2 |
Assessment Date | 2021/10/11 |
Assessor(s) | P. Goldblatt, R.C. Turner & T. Patel |
Justification | This species has an extent of occurrence (EOO) of 249 km², and an area of occupancy (AOO) of 40 km². It is confined to the Piketberg Mountains, and is known from five locations, which are potentially threatened by habitat loss to crop cultivation and alien plant invasion. It is therefore listed as Vulnerable under criteria D. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Western Cape |
Range | An endemic to the Piketberg Mountains in Western Cape province, South Africa. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Piketberg Sandstone Fynbos |
Description | It occurs on stony, sandstone slopes in low fynbos, and is especially abundant after fire. |
Threats |
| This species has lost 15% of its habitat (calculated using landcover data in GIS). It is potentially threatened by expanding agriculture (orchards), dam construction and the spread of invasive alien plants. Habitat has been lost in the past to crop cultivation. |
Population |
It is locally relatively common, and is especially abundant in recently burnt veld.
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Population trend | Stable |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Geissorhiza brevituba (G.J.Lewis) Goldblatt | VU D2 | Raimondo et al. (2009) | | Geissorhiza brevituba (G.J.Lewis) Goldblatt | Rare | Hilton-Taylor (1996) | | Engysiphon brevitubus G.J.Lewis | Uncertain | Hall et al. (1980) | |
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. 1995. New species of the southern African genus Geissorhiza (Iridaceae: Ixioideae). Novon 5(2):156-161.
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.
Hall, A.V., De Winter, M., De Winter, B. and Van Oosterhout, S.A.M. 1980. Threatened plants of southern Africa. South African National Scienctific Programmes Report 45. CSIR, 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 brevituba (G.J.Lewis) Goldblatt. National Assessment: Red List of South African Plants version . Accessed on 2024/09/08 |
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