Acanthopsis tuba

Taxonomy
Scientific Name
Acanthopsis tuba H.M.Steyn
Higher Classification
Dicotyledons
Family
ACANTHACEAE
Synonyms
Acanthopsis carduifolia in the sense of Williamson (2000), not of (L.f.) Schinz (misapplied name)
National Status
Status and Criteria
Endangered B1ab(iii,v)
Assessment Date
2014/10/17
Assessor(s)
L. von Staden & H.M. Steyn
Justification
EOO 1619 km², plants at fewer than five locations continue to decline due to severe overgrazing.
Distribution
Endemism
South African endemic
Provincial distribution
Northern Cape
Range
Richtersveld, Helskloof to Anenous.
Habitat and Ecology
Major system
Terrestrial
Major habitats
Central Richtersveld Mountain Shrubland, Anenous Plateau Shrubland
Description
Well-drained clay-loam soils.
Threats
This species is threatened by overgrazing at all three known locations. At two locations, known through historical records, it cannot be relocated and is possibly already locally extinct.
Population

This species is apparently rare, as it is known from only four collections, from three widely scattered localities. Several searches have relocated this species at only one of these historical localities. In this area, the subpopulation is small and localized, and this species appears to be habitat specific (L. von Staden pers. obs. 2014). The two other localities are severely overgrazed, and the species cannot be relocated in these areas, and may already be locally extinct. As plants are so localized, it is possible however that it may be overlooked. Large areas of the Richtersveld are remote and difficult to access, and it is possible that a few other undiscovered subpopulations may exist.


Population trend
Decreasing
Assessment History
Taxon assessed
Status and Criteria
Citation/Red List version
Acanthopsis sp. (Marloth 12222 PRE)EN B1ab(iii,v)2015.1
Bibliography

Steyn, H.M. and Van Wyk, A.E. 2015. Taxonomic notes on the Acanthopsis disperma-hoffmannseggiana complex (Acanthaceae, tribe Acantheae), with an interim key to members of the genus. Phytotaxa 219(1):1-26.


Williamson, G. 2000. Richtersveld, the enchanted wilderness. Umdaus Press, Pretoria.


Citation
von Staden, L. & Steyn, H.M. 2014. Acanthopsis tuba H.M.Steyn. National Assessment: Red List of South African Plants version 2017.1. Accessed on 2017/03/27

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Distribution map

© L. von Staden

© L. von Staden

© L. von Staden


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