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Scientific Name | Geissorhiza darlingensis Goldblatt |
Higher Classification | Monocotyledons |
Family | IRIDACEAE |
National Status |
Status and Criteria | Critically Endangered B1ab(iii)+2ab(iii); C2a(ii) |
Assessment Date | 2012/10/04 |
Assessor(s) | P. Goldblatt, J.E. Victor, I. Ebrahim & R.C. Turner |
Justification | EOO, AOO <0.008 km², a single known subpopulation of fewer than 250 plants is declining due to alien grass invasion. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Western Cape |
Range | Darling. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Swartland Granite Renosterveld |
Description | Damp sandy soil. |
Threats |
| The only known subpopulation of this species is confined to a tiny nature reserve of 20 hectares surrounded by crop fields. A number of threatened lowland renosterveld endemics occur in this reserve, however, the habitat is increasingly impacted by invasive alien grasses spreading as a result of disturbance and nutrient enrichment due to runoff from nearby crop fields. |
Population |
One subpopulation is known. In 2004 between 100 and 250 plants were recorded. Subsequent visits in 2005 and 2007 recorded only between 10 and 50 plants. It is suspected that plants are either declining due to ever increasing eutrophication and alien invasive grasses, or otherwise remaining dormant and not flowering.
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Population trend | Decreasing |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Geissorhiza darlingensis Goldblatt | CR B1ab(iii)+2ab(iii); C2a(ii) | Raimondo et al. (2009) | | Geissorhiza darlingensis Goldblatt | Indeterminate | Hilton-Taylor (1996) | |
Bibliography |
Duncan, G. 2002. Just holding on: spectacular geophytes in peril. Veld & Flora 88(4):142-147.
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.
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., Victor, J.E., Ebrahim, I. & Turner, R.C. 2012. Geissorhiza darlingensis Goldblatt. National Assessment: Red List of South African Plants version 2020.1. Accessed on 2023/12/01 |
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