Clethra arborea 

Scope: Global & Europe
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Magnoliopsida Ericales Clethraceae

Scientific Name: Clethra arborea Aiton
Taxonomic Source(s): The Plant List. 2015. The Plant List. Version 1.1. Available at:

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2017
Date Assessed: 2016-09-15
Assessor(s): Beech, E. & da Silva Menezes de Sequeira, M.
Reviewer(s): Fernandes, F., Reyes Betancort, J.A., Scholz, S., Silva, L. & Allen, D.J.
This species is a small tree found only in Madeira. It is here assessed as Least Concern as although it has a restricted extent of occurrence the population is large and stable. There are no significant threats to indicate a risk of extinction currently. The tree is found in several protected areas.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species is endemic to Madeira and is invasive in the Azores. It is found between 200 and 1,300 m asl. The estimated extent of occurrence of this species is 310 km2 and the area of occupancy (AOO) is 192 km2. Old records from Tenerife in the Canaries are uncertain in origin and identity (there is no voucher material), and it is no longer present on the island.
Countries occurrence:
Portugal (Azores - Introduced, Madeira)
Additional data:
Estimated area of occupancy (AOO) - km2:192Continuing decline in area of occupancy (AOO):No
Estimated extent of occurrence (EOO) - km2:310
Continuing decline in extent of occurrence (EOO):No
Lower elevation limit (metres):200
Upper elevation limit (metres):1300
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:There is no information about population numbers of this species, but it is estimated to be above 100,000 individuals. The population trend is stable.
Current Population Trend:Stable
Additional data:
Continuing decline of mature individuals:No
Extreme fluctuations:NoPopulation severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:This species is a small tree of up to 15 m. This species is one of the major components of temperate laurisilva forest.
Continuing decline in area, extent and/or quality of habitat:Unknown

Use and Trade [top]

Use and Trade: This plant is used in horticulture. It was used for inlay and wood crafting. It was also used as walking sticks, fuels, furniture, fishing rods and other wooden implements.

Threats [top]

Major Threat(s): The habitat has been threatened in recent years by fire, but only in limited areas. The invasion of invasive species is the biggest threat to this species; Pittosporum and Acacia are reducing the quality of the habitat.

Conservation Actions [top]

Conservation Actions: This species was previously assessed as 'Lower Risk/least concern' (World Conservation Monitoring Centre 1998). Parts of its range are protected within the Natural Park of Madeira, Natura 2000 sites and the World Heritage Site. Invasive species control would be beneficial for this species. Clethra arborea is reported as held in 36 ex situ collections (BGCI 2015).

Citation: Beech, E. & da Silva Menezes de Sequeira, M. 2017. Clethra arborea. The IUCN Red List of Threatened Species 2017: e.T38395A81768844. . Downloaded on 19 September 2018.
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