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Scientific Name | Acanthopsis tetragona H.M.Steyn subsp. tetragona |
Higher Classification | Dicotyledons |
Family | ACANTHACEAE |
National Status |
Status and Criteria | Rare |
Assessment Date | 2022/10/31 |
Assessor(s) | H.M. Steyn & L. von Staden |
Justification | A rare, range-restricted taxon with an extent of occurrence (EOO) of 203 km², and known from four locations but not threatened. It therefore qualifies for listing as Rare nationally and qualifies under the IUCN 3.1. criteria as Least Concern. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Northern Cape |
Range | This taxon has a restricted range in the Richtersveld east of Eksteenfontein, in the Northern Cape Province, South Africa. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Kosiesberg Succulent Shrubland, Rooiberg Quartz Vygieveld, Kahams Mountain Desert |
Description | It grows in cracks and crevices in granite outcrops. |
Threats |
| Overgrazing and degradation of communally owned rangelands due to severe overstocking is the most severe threat to plant species across the Richtersveld. This taxon is however not browsed, and its habitat provides it protection against the effects of trampling and erosion. |
Population |
There are four known subpopulations of this taxon within a small area. One subpopulation is large, consisting of at least 100 mature individuals, the second is smaller, consisting of between 50 and 100 mature individuals. The third subpopulation is known through historical records and has not been counted. The population is not suspected to be declining.
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Population trend | Stable |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Acanthopsis tetragona H.M.Steyn subsp. tetragona | Rare | 2017.1 | |
Bibliography |
Steyn, H.M. and Van Wyk, A.E. 2017. Taxonomic notes on Acanthopsis Harv. (Acanthaceae, tribe Acantheae): the group with trifid bracts. Phytotaxa 295(3):201-217.
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Citation |
| Steyn, H.M. & von Staden, L. 2022. Acanthopsis tetragona H.M.Steyn subsp. tetragona. National Assessment: Red List of South African Plants version . Accessed on 2025/04/14 |
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