Back to search results

Disa cedarbergensis

Assessor: Sarah Schumann

Sensitive in 2010
No
Family
Orchidaceae
Reason for the sensitivity status
As this species is very rare and has not been seen since its original collection, it is likely that if this species were exploited, its entire extant population would be harvested and its chances of recruitment would be removed
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 Critically Rare as it is has not been seen since its original collection record (von Staden, 2006). Other species in this genus are known to be threatened by collection of wild individuals (von Staden et al. 2012; von Staden & Liltved, 2012).

von Staden, L. & Raimondo, D. 2006. Disa cedarbergensis H.P.Linder. National Assessment: Red List of South African Plants version 2020.1. 

von Staden, L., Oliver, E.G.H. & Raimondo, D. 2012. Disa longicornu L.f. National Assessment: Red List of South African Plants version 2020.1. 

von Staden, L. & Liltved, W.R. 2012. Disa lugens Bolus var. nigrescens (H.P.Linder) H.P.Linder. 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 only known from its original collection, has not been seen again and is thought to be a naturally very rare species (von Staden, 2006).

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

As this species is very rare and has not been seen since its original collection, it is likely that if this species were exploited, its entire extant population would be harvested and its chances of recruitment would be removed (von Staden, 2006).

von Staden, L. & Raimondo, D. 2006. Disa cedarbergensis H.P.Linder. National Assessment: Red List of South African Plants version 2020.1. 

Reference file
Disa cedarbergensis Threatened Species Programme _ SANBI Red List of South African Plants.pdf539.22 KB