Acanthopsis tetragona subsp. tetragona

Taxonomy
Scientific Name
Acanthopsis tetragona H.M.Steyn subsp. tetragona
Higher Classification
Dicotyledons
Family
ACANTHACEAE
National Status
Status and Criteria
Rare
Assessment Date
2016/10/05
Assessor(s)
H.M. Steyn & L. von Staden
Justification
A rare, range-restricted taxon (EOO 34 km²), but not threatened.
Distribution
Endemism
South African endemic
Provincial distribution
Northern Cape
Range
Richtersveld east of Eksteenfontein.
Habitat and Ecology
Major system
Terrestrial
Major habitats
Desert, Succulent Karoo
Description
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 three 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.


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.


Citation
Steyn, H.M. & von Staden, L. 2016. Acanthopsis tetragona H.M.Steyn subsp. tetragona. National Assessment: Red List of South African Plants version 2020.1. Accessed on 2020/07/09

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Distribution map


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