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Scientific Name | Cyanella aquatica Oberm. ex G.Scott |
Higher Classification | Monocotyledons |
Family | TECOPHILAEACEAE |
National Status |
Status and Criteria | Endangered B1ab(iii,v)+2ab(iii,v) |
Assessment Date | 2015/06/01 |
Assessor(s) | D. Raimondo, S. Todd, E. Marinus & L. von Staden |
Justification | A range-restricted species (EOO 142 km²), known from five locations, and declining due to ongoing habitat degradation and competition from alien invasive plants. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Northern Cape |
Range | Bokkeveld Escarpment. |
Habitat and Ecology |
Major system | Freshwater |
Major habitats | Tanqua Escarpment Shrubland, Nieuwoudtville-Roggeveld Dolerite Renosterveld |
Description | Wedged among dolerite rocks in seasonally waterlogged clay soils. |
Threats |
| This species' habitat is utilized for livestock grazing, and disturbance as a result of overgrazing and trampling, especially of sensitive wetland areas, is causing ongoing habitat degradation. Field observations indicate that this species is absent on heavily grazed farms, in spite of suitable habitat present, and seed set has been reduced due to grazing in other areas (S. Todd pers. obs.). Some subpopulations are also threatened by competition from dense infestations of alien invasive grasses. |
Population |
This species occurs in small, localized stands of fewer than 100 mature individuals in seasonally damp patches. Most collections are from Dolerite Renosterveld to the east of Nieuwoudtville, where plants have been recorded across four adjacent farms, possibly representing a single subpopulation. There is also one collection from clay soils in succulent karoo south-west of Calvinia, about 40 km from the Nieuwoudtville subpopulation.
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Population trend | Decreasing |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Cyanella aquatica Oberm. ex G.Scott | EN B1ab(iii,v)+2ab(iii,v) | 2015.1 | | Cyanella aquatica Oberm. ex G.Scott | VU D1+2 | Raimondo et al. (2009) | | Cyanella aquatica Oberm. ex G.Scott | Rare | Hilton-Taylor (1996) | |
Bibliography |
Cook, C.D.K. 2004. Aquatic and wetland plants of southern Africa. Backhuys Publishers, Leiden, The Netherlands.
Hilton-Taylor, C. 1996. Red data list of southern African plants. Strelitzia 4. South African National Botanical Institute, Pretoria.
Manning, J.C. and Goldblatt, P. 2012. A revision of Tecophilaeaceae subfam. Tecophilaeoideae in Africa. Bothalia 42(1):21-41.
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.
Scott, G. 1991. A revision of Cyanella (Tecophilaeaceae) excluding C. amboensis. South African Journal of Botany 57(1):34-54.
Sieben, E.J.J. 2009. The status and distribution of vascular plants (Magnoliophyta, Lycophyta, Pteridophyta). In: W.R.T. Darwall, K.G. Smith, D. Tweddle and P. Skelton (eds.), The status and distribution of freshwater biodiversity in southern Africa (pp. 83-98), IUCN and SAIAB, Gland, Switzerland and Grahamstown, South Africa.
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Citation |
| Raimondo, D., Todd, S., Marinus, E. & von Staden, L. 2015. Cyanella aquatica Oberm. ex G.Scott. National Assessment: Red List of South African Plants version . Accessed on 2025/04/14 |
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