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Exacum socotranum

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Taxonomy [top]

Kingdom Phylum Class Order Family
PLANTAE TRACHEOPHYTA MAGNOLIOPSIDA GENTIANALES GENTIANACEAE

Scientific Name: Exacum socotranum
Species Authority: Balf.f.

Assessment Information [top]

Red List Category & Criteria: Critically Endangered B2ab(iii) ver 3.1
Year Published: 2013
Date Assessed: 2012-05-02
Assessor(s): Knees, S.G., Patzelt, A. & Miller, A.
Reviewer(s): García, N. & Tognelli, M.
Contributor(s): Williams, L. & Neale, S.
Justification:
The species is known only from a few scattered populations growing near freshwater springs and seepages on the southern limestone escarpment (one location), and its area of occupancy is estimated as no more than 4 km². There are only a few of these springs and therefore the total number of plants is likely to be very low. A continuing decline in the quality of the habitat for this species has been observed due to surface water extraction and housing development. Therefore, the species is listed as Critically Endangered.
History:
2012 Critically Endangered
2004 Endangered

Geographic Range [top]

Range Description: This species is endemic to the island of Socotra, Yemen (Miller and Morris 2004). The species is known only from a few scattered populations growing near freshwater springs and seepages on the southern limestone escarpment, which are considered as only one location. The area of occupancy is estimated at 4 km².
Countries:
Native:
Yemen (Socotra)
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: The species is known only from a few scattered populations growing near freshwater springs and seepages on the southern limestone escarpment. There are only a few of these springs and therefore the total number of plants is likely to be very low.
Population Trend: Unknown

Habitat and Ecology [top]

Habitat and Ecology: The species is found hanging near seepages on vertical cliffs on southern limestone escarpment. It was found at altitudes of ca 130 m (Miller and Morris 2004). This habitat is extremely vulnerable to water development. (See Helichrysum sp. nov., Erythoxylum socotranum and Scaveola socotraensis).
Systems: Terrestrial; Freshwater

Use and Trade [top]

Use and Trade:

There is no evidence to suggest that this species is used or traded.

Threats [top]

Major Threat(s): This habitat is extremely vulnerable to water system management changes (surface water extraction) and housing development (Knees pers. obs. 2007), which is the major current threat to the species.

Conservation Actions [top]

Conservation Actions: In-situ protection of the habitat is highly recommended and ex-situ conservation measures should also be taken.

Citation: Knees, S.G., Patzelt, A. & Miller, A. 2013. Exacum socotranum. The IUCN Red List of Threatened Species. Version 2014.3. <www.iucnredlist.org>. Downloaded on 22 December 2014.
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