Acanthopsis tetragona subsp. pedunculata

Taxonomy
Scientific Name
Acanthopsis tetragona H.M.Steyn subsp. pedunculata H.M.Steyn
Higher Classification
Dicotyledons
Family
ACANTHACEAE
National Status
Status and Criteria
Vulnerable D2
Assessment Date
2016/10/05
Assessor(s)
H.M. Steyn & L. von Staden
Justification
A highly localized taxon (EOO <10 km²), that is known from one location where it is potentially threatened by habitat loss and degradation due to erosion.
Distribution
Endemism
South African endemic
Provincial distribution
Northern Cape
Range
Richtersveld near Eksteenfontein.
Habitat and Ecology
Major system
Terrestrial
Major habitats
Central Richtersveld Mountain Shrubland
Description
Well-drained sandy loam soils with quartz rubble on rocky lower slopes.
Threats
This subspecies' entire known range falls within communally owned rangelands that are overstocked with livestock. Overgrazing has already caused severe degradation of succulent shrublands across the Richtersveld, with a loss of shrub cover and species diversity in many areas. This subspecies is not grazed, but it is potentially vulnerable to trampling and erosion, as it occurs in open sandy places. In areas close to settlements where shrub cover has been almost completely lost, slopes with bare soil are particularly prone to erosion during heavy rainfall (P.C.V. van Wyk pers. comm.). The population, being very localized, is potentially vulnerable to habitat loss to erosion.
Population

This species is known from a small area to the north of Eksteenfontein. Field surveys have located one subpopulation of approximately 100 mature individuals, but historical collections suggest that there may be other subpopulations on the lower slopes of the Stinkfontein Mountains and Wildeperderant.


Population trend
Stable
Citation
Steyn, H.M. & von Staden, L. 2016. Acanthopsis tetragona H.M.Steyn subsp. pedunculata H.M.Steyn. National Assessment: Red List of South African Plants version 2017.1. Accessed on 2017/04/24

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Distribution map


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