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Scientific Name | Geissorhiza radians (Thunb.) Goldblatt |
Higher Classification | Monocotyledons |
Family | IRIDACEAE |
Synonyms | Geissorhiza rochensis Ker Gawl. (in part), Geissorhiza rochensis Ker Gawl. var. rochensis |
Common Names | Wine Cup (e), Wynblommetjie (a) |
National Status |
Status and Criteria | Near Threatened B1ab(ii,iii,iv,v)+2ab(ii,iii,iv,v) |
Assessment Date | 2023/06/15 |
Assessor(s) | D. Raimondo & N.A. Helme |
Justification | This formerly widespread and common species now has an extent of occurrence (EOO) of 2173 km² and an area of occupancy (AOO) of 140 km². Its EOO and AOO are now much reduced due to habitat loss to agricultural expansion. Between 25 and 30 locations remain on isolated remnants of natural vegetation. The population is declining as a result of alien plant invasion, livestock grazing and effects of fertiliser and pesticide runoff. It is therefore listed as Near Threatened under criterion B. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Western Cape |
Range | It is endemic to Western Cape province of South Africa, and extends from Yzerfontein and Darling south to Paarl and in the past it occurred all the way to Somerset West. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Swartland Shale Renosterveld, Swartland Granite Renosterveld, Atlantis Sand Fynbos, Swartland Alluvium Fynbos |
Description | It occurs in seasonally damp sites in sands of granitic origin. |
Threats |
| This species has lost 69% of its habitat (calculated using landcover data in GIS) to crop cultivation and urban development. More than 50% of subpopulations known from herbarium records have gone extinct. Remaining subpopulations continue to decline due to animal grazing, the impacts of invasive alien grasses and the effects of fertilisers and herbicide runoff. |
Population |
This is a formerly widespread and common species along the western Cape coastal lowlands. Due to extensive habitat loss it is now confined to fragments between Darling and Klapmuts. There has been a significant increase in the number of observations made of this species in the past 10 years. There were 9 subpopulations known in 2012, which has now gone up to 25 subpopulations recorded in 2022. The population is however still decreasing due to habitat degradation from invasive alien grasses, livestock overgrazing and eutrophication.
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Population trend | Decreasing |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Geissorhiza radians (Thunb.) Goldblatt | EN 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. 2023. Geissorhiza radians (Thunb.) Goldblatt. National Assessment: Red List of South African Plants version . Accessed on 2024/09/08 |
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