Back to search results

Gasteria croucheri

Assessor: Sarah Schumann

Sensitive in 2010
No
Family
Asphodelaceae
Reason for the sensitivity status
This species is experiencing population decline due to wild harvesting for the medicinal plant trade. Several others of the genus are known to be targeted, exploited and illegally removed from the wild, causing population decline. Evidence shows that the Gasteria genus is in high demand in international horticultural trade. One known location makes this species highly vulnerable to population loss. Releasing data on this species can exacerbate threat and vulnerability.
This species is extremely rare in the wild and is known to be exploited, utilised or traded. The localities of remaining populations need to be protected to avoid any further exploitation, which is likely to drive it to extinction.
Exploitation extent
Significant - wild individuals of the species are known to be exploited, collected, traded or utilized in a targeted manner, and utilisation is widespread, affects the majority of wild populations and/or is causing rapid decline of the wild population.
Justification and references

According to the SANBI Red List Assessment, this species is Vulnerable as it is experiencing population decline due to consistent and high harvesting rates of wild individuals for the medicinal plant trade (van Jaarsveld & Raimondo, 2019). This genus is currently in demand and of popular interest in international horticultural trade, as indicated by several online marketplace, e-commerce and auction sites. Several species of the Gasteria genus were among those targeted and confiscated during recent criminal prosecutions of illegal plant collecting (Confiscation Lists (2021) provided by SANParks Sendelingsdrift Botanic Garden and Kirstenbosch Botanical Garden). 

van Jaarsveld, E.J. & Raimondo, D. 2019. Gasteria croucheri (Hook.f.) Baker. National Assessment: Red List of South African Plants version 2020.1.

Population vulnerability
Population is vulnerable: size is <= 2500 mature individuals OR the number of known subpopulations is <= 5 OR range is <= 100km2 OR species at risk of localised extinctions
Justification and references

This taxon has declined by 30% over three generations (generation length 30-40 years) (van Jaarsveld & Raimondo, 2019).

van Jaarsveld, E.J. & Raimondo, D. 2019. Gasteria croucheri (Hook.f.) Baker. National Assessment: Red List of South African Plants version 2020.1.

Targeted demographics
Mature (breeding) individuals are killed, significantly weakened or are permanently removed from the wild, OR immature individuals are targeted and this significantly impacts mature (breeding) individuals.
Justification and references

Whole plants are seen at medicinal markets (van Jaarsveld & Raimondo, 2019).

van Jaarsveld, E.J. & Raimondo, D. 2019. Gasteria croucheri (Hook.f.) Baker. National Assessment: Red List of South African Plants version 2020.1.

Regeneration potential
This species has a slow population growth rate, or the growth rate varies depending on habitat, and there is a poor chance the wild populations will recover from exploitation OR a collector might feasibly harvest the entire extant population removing the chance of subsequent recruitment.
Justification and references

Unknown population size or extent of occurrence with ongoing threat makes this species vulnerable to population loss.

Reference file
Gasteria croucheri Threatened Species Programme _ SANBI Red List of South African Plants.pdf754.51 KB
Gasteria Aucfan.pdf668.44 KB
gasteria _ eBay.pdf1.01 MB