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Hibiscus socotranus

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Taxonomy [top]

Kingdom Phylum Class Order Family
PLANTAE TRACHEOPHYTA MAGNOLIOPSIDA MALVALES MALVACEAE

Scientific Name: Hibiscus socotranus
Species Authority: G.Ll.Lucas

Assessment Information [top]

Red List Category & Criteria: Endangered B2ab(iii) ver 3.1
Year Published: 2004
Date Assessed: 2004-04-30
Assessor(s): Miller, A.
Reviewer(s): Abuzinada, A.H. & AL-Eisawi, D.M.H. (Arabian Plants Red List Authority)
Justification:
Only known from a single collection made in 1967 on the limestone escarpment south of Qallansiyah. This is a classic locality, visited by most botanists exploring the island and it is therefore suprising that this showy species has not been collected again. It is considered endangered as (i) it occupies an area of less than 10 km², and (ii) it is suspected that this escarpment is suffering from the trend of lower rainfall in the region.

Geographic Range [top]

Range Description: Endemic to Soqotra.
Countries:
Native:
Yemen (Socotra)
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population Trend: Unknown

Habitat and Ecology [top]

Habitat and Ecology: Open deciduous succulent shrubland.

Distinguished by its low habit and its fused epicalyx. The relationship between H. socotranus and the other Soqotran endemic Hibiscus spp. is not clear. The degree of fusion of the epicalyx (to about one third) is unusual within Hibiscus and unique amongst the species on Soqotra; the only other species with a similarly fused epicalyx is H. erlangeri from Somalia which, on account of its epicalyx, has sometimes been separated into the monotypic genus Symphochlamys. Hibiscus erlangeri differs from H. socotranus in its calyx which splits into two, more or less entire lobes and in this resembles some of the other endemic Soqotran species (e.g., H. scottii, H. malacophyllus, H. macropodus, H. diriffan and H. quattanensis). Collected by John Lavranos and Alan Radcliffe-Smith, in 1967 on the north-facing limestone escarpment above Qaysoh near Qalansiyah at the western end of Soqotra. There are several other local endemics and plants of note on this escarpment. These include Boswellia bullata, Dorstenia gigas, Prenanthes amabilis, Aloe squarrosa, Gaillonia thymoides and Hypericum socotranum subsp. socotranum.
Systems: Terrestrial

Citation: Miller, A. 2004. Hibiscus socotranus. The IUCN Red List of Threatened Species. Version 2014.3. <www.iucnredlist.org>. Downloaded on 29 November 2014.
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