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Scientific Name | Nenax hirta (Cruse) T.M.Salter subsp. calciphila Puff |
Higher Classification | Dicotyledons |
Family | RUBIACEAE |
National Status |
Status and Criteria | Vulnerable B1ab(ii,iii,v)+2ab(ii,iii,v) |
Assessment Date | 2021/03/23 |
Assessor(s) | H. Mtshali & N.A. Helme |
Justification | This taxon has a small distribution and is restricted to the Strandveld region of the Western Cape Province. It has an extent of occurrence (EOO) of 768-1 018 km², and an area of occupancy (AOO) of 92-100 - 100 km². It is known from 10 locations that continue to decline due to agriculture expansion, coastal and industrial development, and mining. There has been a 10% reduction in the population due to housing developments at Jacobsbaai and development around the iron-ore terminal in Saldanha. It therefore qualifies for Vulnerable under criterion B. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Western Cape |
Range | This taxon has a restricted distribution in the Western Cape, where it occurs from Vredenburg to Saldanha to Yzerfontein. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Langebaan Dune Strandveld, Saldanha Limestone Strandveld, Saldanha Flats Strandveld, Saldanha Granite Strandveld |
Description | It is confined to strandveld on calcrete. |
Threats |
| This species' habitat in the Strandveld has been fragmented through extensive loss to agriculture, coastal urban and industrial expansion, and mining. About 38% of its habitat is irreversibly modified, and loss continues due to mining, agriculture, and the invasion of habitat by alien plants.
The observed loss at Jacobsbaai and iron-ore terminal Saldanha is estimated at 10% over the last ten years. |
Population |
It is common in limestone strandveld, with 12 subpopulations known, the largest consisting of more than 1 000 mature individuals. A few of these are isolated and small in size. A continuing decline is inferred from ongoing habitat loss and degradation.
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Population trend | Decreasing |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Nenax hirta (Cruse) T.M.Salter subsp. calciphila Puff | NT B1ab(ii,iii,v)+2ab(ii,iii,v) | Raimondo et al. (2009) | |
Bibliography |
Puff, C. 1986. Paederieae, Anthospermeae, Rubieae. In: O.A. Leistner (ed). Flora of Southern Africa 31 Part 1 Rubiaceae, Fascicle 2 Rubioideae (Second part):1-76. Botanical Research 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 |
| Mtshali, H. & Helme, N.A. 2021. Nenax hirta (Cruse) T.M.Salter subsp. calciphila Puff. National Assessment: Red List of South African Plants version . Accessed on 2024/12/07 |
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