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Nepenthes rigidifolia 

Scope: Global
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Magnoliopsida Nepenthales Nepenthaceae

Scientific Name: Nepenthes rigidifolia Akhriadi, Hernawati & Tamin
Taxonomic Source(s): Akhriadi, P., Hernawati and Tamin, R. 2004. A new species of Nepenthes (Nepenthaceae) from Sumatra. Reinwardtia 12(2): 141-144.

Assessment Information [top]

Red List Category & Criteria: Critically Endangered A2ad+3d; B1ab(iv,v)+2ab(iv,v); C2a(i,ii); D ver 3.1
Year Published: 2014
Date Assessed: 2013-12-06
Assessor(s): Clarke, C.M.
Reviewer(s): Cantley, R.
Contributor(s): Hernawati, N., Lee, C. & Sarunday, C.
Justification:
Of all Nepenthes species, Nepenthes rigidifolia may be the closest to extinction in the wild at present. The only known population (about ten plants in a tiny area - 0.01 km2) faces extinction within the next few years unless urgent measures are taken to protect the remaining plants and reintroduce artificially propagated plants to the site. The 90% decline in numbers of mature individuals over the past 30 years is due primarily to collection of plants by enthusiasts, and as the only known population is very small, even low rates of off-take will have had significant impacts on population size. It is suspected that the species could go extinct in the wild within the next 30 years (three generations). It is feasible that other, undetected subpopulations exist in north Sumatra, but despite extensive searches of apparently suitable habitats around Lake Toba, this species has yet to be found elsewhere. For this reason, it is important to survey other areas of potentially suitable habitat in North Sumatra to try to find other populations of this species, as other conservation measures may not be effective in time to save the remaining plants at the type locality.

Geographic Range [top]

Range Description:The only known population of N. rigidifolia is confined to a single, small roadside embankment in North Sumatra Province, Indonesia. It occurs between 1,400 and 1,600 m asl.
Countries occurrence:
Native:
Indonesia (Sumatera)
Additional data:
Estimated area of occupancy (AOO) - km2:0.01
Number of Locations:1
Lower elevation limit (metres):1400
Upper elevation limit (metres):1600
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:The only known population of N. rigidifolia is very small and has been substantially depleted due to the collection of plants from the wild by enthusiasts of Nepenthes. The population is thought to comprise only ten mature individuals.
Current Population Trend:Decreasing
Additional data:
Number of mature individuals:10Continuing decline of mature individuals:Yes
Extreme fluctuations:UnknownPopulation severely fragmented:No
No. of subpopulations:1Continuing decline in subpopulations:Yes
Extreme fluctuations in subpopulations:NoAll individuals in one subpopulation:Yes

Habitat and Ecology [top]

Habitat and Ecology:N. rigidifolia grows terrestrially in lower montane forest near Lake Toba in North Sumatra province. The only known population grows on and around a roadside embankment where the vegetation has been substantially disturbed due to the construction of the road and timber extraction in the surrounding forest.
Systems:Terrestrial
Continuing decline in area, extent and/or quality of habitat:No
Generation Length (years):10

Use and Trade [top]

Use and Trade: N. rigidifolia has no known uses outside horticulture. The pitchers of this species are attractive and its rarity confers additional value upon it in the minds of some collectors.

Threats [top]

Major Threat(s): Over-collection of plants from the wild represents a significant threat to this species, as the only known population is very small. The habitat of this species has also been substantially disturbed due to the construction of the road and timber extraction in the surrounding forest.

Conservation Actions [top]

Conservation Actions: There are no species-specific conservation actions in place at present. The species is listed on CITES Appendix II.

Citation: Clarke, C.M. 2014. Nepenthes rigidifolia. The IUCN Red List of Threatened Species 2014: e.T49002226A49009927. . Downloaded on 21 October 2017.
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