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Begonia oxyanthera

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Taxonomy [top]

Kingdom Phylum Class Order Family
PLANTAE TRACHEOPHYTA MAGNOLIOPSIDA CUCURBITALES BEGONIACEAE

Scientific Name: Begonia oxyanthera
Species Authority: Warb.
Taxonomic Notes: Includes B. jussiaecarpa Warb. of FWTA. This species, of sect. Tetraphila A.DC. is closely related to B. preussii and can be regarded as an altitudinal vicariant (information on these species provided by Marc Sosef and Hans De Wilde, Wageningen).

Assessment Information [top]

Red List Category & Criteria: Vulnerable A2c ver 3.1
Year Published: 2004
Date Assessed: 2004-04-30
Assessor(s): Cheek, M.
Reviewer(s): Hilton-Taylor, C. & Pollock, C.M. (Red List Programme Office)
Justification:
In previous Red Data assessments (Cable and Cheek 1998 and Cheek et al. 2000) this taxon was listed as LR/nt. Here it is reassessed as Vulnerable because of habitat destruction in what appears to be its main subpopulation in the Bamenda Highlands from which most of the ca. 30 specimens listed by de Wilde (2002) derive. Moat (in Cheek et al. 2000) records forest loss in the Kilum-Ijim protected area itself. Since the 'generation' duration of this taxon might easily be five years, it is estimated that habitat loss for the species over its area of occupancy as a whole is likely to have been over 30% in the last 15 years.

Geographic Range [top]

Range Description: The species occurs in Cameroon: Mt Cameroon (four collections), Mt Kupe and the Bakossi Mts (five collections), Rumpi Hills (one collection), Bamboutos Mts (two collections), Muanenguba (one collection), Bamenda Highlands (17 coll.); Equatorial Guinea: Bioko (six collections from two sites); and southeastern Nigeria (one collection). The range data are from the account of the species in the recently published revision of Begonia sect. Tetraphila (de Wilde 2002).
Countries:
Native:
Cameroon; Equatorial Guinea (Bioko)
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: Known from submontane and montane forest at 1,200–2,200(–2,400) m altitude. The increasing density of this species, moving northwards (Mt Cameroon and Bioko only ca. 2 sites each; Bamenda Highlands numerous sites and coll.) is perhaps a reflection of a longer dry season requirement.
Systems: Terrestrial

Threats [top]

Major Threat(s): The main threat to the species is forest clearance for wood and agriculture (mainly in the Bamenda Highlands).

Conservation Actions [top]

Conservation Actions: Subpopulations in the S.W. Province of Cameroon, and probably also in Bioko, are fairly secure, lacking threats. In the N.W. Province of Cameroon the substantial subpopulation in the well protected Kilum-Ijim site (Mt Oku and the Ijim Ridge) may be the only locality where the taxon will survive, unfortunately, thus protection here is important.

Citation: Cheek, M. 2004. Begonia oxyanthera. The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 25 October 2014.
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