Reason for the sensitivity status
This species is potentially threatened by harvesting of wild individuals for the specialist succulent horticultural trade. Other species of this genus are known to be utilized for horticultural trade. A small population size with potential threat of harvesting makes this species vulnerable to population loss. Were exploitation to occur, recruitment and recovery may be poor. Releasing data on this species could exacerbate threat and vulnerability.
This species is either similar to another sensitive species or belongs to a group containing sensitive species, and is extremely rare in the wild. The localities of wild populations need to be protected to avoid loss to exploitation, which, due to its rarity, could drive the species to extinction within a very short time.
Exploitation extent
Uncertain - No data exists yet showing that this species is exploited in the wild, however it has one or more relatives or look-alike species (found in South Africa or globally) that are known to be utilised. This species has a similar life form or other relevant traits to its exploited relative(s), making it highly likely that it would be exploited for the same purposes.
Justification and references
According to the SANBI Red List Assessment, this species is Vulnerable as it is known from one location that is potentially threatened by harvesting of wild individuals for the specialist succulent horticultural trade (Victor, 2004). 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. Species of this genus are known to be utilized for horticultural trade which could threaten vulnerable species with removal and collection from the wild.
Victor, J.E. 2004. Tanquana archeri (L.Bolus) H.E.K.Hartmann & Liede. 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 is known from one location (Victor, 2004).
Victor, J.E. 2004. Tanquana archeri (L.Bolus) H.E.K.Hartmann & Liede. National Assessment: Red List of South African Plants version 2020.1.
Targeted demographics
Unknown.
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
One known location and potential threat places the persistence of this species at risk.
