Gasteria disticha var. langebergensis

Taxonomy
Scientific Name
Gasteria disticha (L.) Haw. var. langebergensis Van Jaarsv.
Higher Classification
Monocotyledons
Family
ASPHODELACEAE
National Status
Status and Criteria
Endangered B1ab(ii,iii,v)+2ab(ii,iii,v)
Assessment Date
2015/09/21
Assessor(s)
E.J. van Jaarsveld, D. Raimondo & L. von Staden
Justification
A range-restricted species (EOO 45 km²), known from two locations and declining at one of these due to habitat loss to limestone quarrying.
Distribution
Endemism
South African endemic
Provincial distribution
Western Cape
Range
Worcester to Robertson.
Habitat and Ecology
Major system
Terrestrial
Major habitats
Breede Shale Renosterveld
Description
Limestone outcrops in Breede Shale Renosterveld.
Threats
The subpopulation at the type locality is threatened by ongoing habitat loss to quarrying. A second subpopulation is not currently threatened, but is potentially vulnerable to limestone mining.
Population

This taxon was previously known from a single, small subpopulation that is declining due to habitat loss to quarrying. Recent field surveys recorded a second subpopulation about 10 kilometres from the type locality, indicating that is more widespread in suitable habitat, and quite likely overlooked. More surveys are needed to determine the full range and size of the population.


Population trend
Decreasing
Assessment History
Taxon assessed
Status and Criteria
Citation/Red List version
Gasteria disticha (L.) Haw.CR B1ab(ii,iii,v)+2ab(ii,iii,v)Raimondo et al. (2009)
Bibliography

Raimondo, D., von Staden, L., Foden, W., Victor, J.E., Helme, N.A., Turner, R.C., Kamundi, D.A. and Manyama, P.A. 2009. Red List of South African Plants. Strelitzia 25. South African National Biodiversity Institute, Pretoria.


Van Jaarsveld, E. 2007. The genus Gasteria: a synoptic review (new taxa and combinations). Aloe 44(4):84-104.


Citation
van Jaarsveld, E.J., Raimondo, D. & von Staden, L. 2015. Gasteria disticha (L.) Haw. var. langebergensis Van Jaarsv. National Assessment: Red List of South African Plants version 2017.1. Accessed on 2017/03/27

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Distribution map


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