Acanthopsis dregeana subsp. dregeana

Taxonomy
Scientific Name
Acanthopsis dregeana H.M.Steyn subsp. dregeana
Higher Classification
Dicotyledons
Family
ACANTHACEAE
National Status
Status and Criteria
Critically Endangered B1ab(iii,v)+2ab(iii,v)
Assessment Date
2015/10/09
Assessor(s)
L. von Staden & H.M. Steyn
Justification
A localized habitat specialist (EOO <10 km²), known from one location where it is declining due to overgrazing.
Distribution
Endemism
South African endemic
Provincial distribution
Northern Cape
Range
Richtersveld north-west of Eksteenfontein.
Habitat and Ecology
Major system
Terrestrial
Major habitats
Lekkersing Succulent Shrubland, Central Richtersveld Mountain Shrubland
Description
Gentle slopes in Central Richtersveld Mountain Shrubland.
Threats
Lower slopes and plains close to settlements in the Richtersveld are continually degraded due to severe, ongoing overgrazing as a result of overstocking of communal rangelands. Overgrazing has caused loss of plant species diversity and shrub cover, and is also leading to erosion of exposed slopes and drainage lines. Field observations indicate that this species is heavily grazed (H.M. Steyn pers. obs.), and the population is in decline as a result.
Population

This species is known from two small, localized subpopulations about 7 km apart. Both occur within severely overgrazed communal rangelands owned by the same community, and it is therefore considered one location.


Population trend
Decreasing
Assessment History
Taxon assessed
Status and Criteria
Citation/Red List version
Acanthopsis dregeana H.M.Steyn subsp. dregeana CR B1ab(iii,v)+2ab(iii,v)2017.1
Acanthopsis dregeana H.M.Steyn subsp. dregeana CR B1ab(iii,v)+2ab(iii,v)2017.1
Bibliography

Steyn, H.M. and Van Wyk, A.E. 2016. Taxonomic notes on the shrublet species of Acanthopsis (Acanthaceae, tribe Acantheae), with two new species from South Africa. Phytotaxa 244(2):145-160.


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
von Staden, L. & Steyn, H.M. 2015. Acanthopsis dregeana H.M.Steyn subsp. dregeana. National Assessment: Red List of South African Plants version 2020.1. Accessed on 2020/07/03

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Distribution map


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