Begonia pseudoviola 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Magnoliopsida Cucurbitales Begoniaceae

Scientific Name: Begonia pseudoviola Gilg

Assessment Information [top]

Red List Category & Criteria: Endangered A2c; B2ab(ii,iii,iv,v) ver 3.1
Year Published: 2015
Date Assessed: 2011-03-25
Assessor(s): Cheek, M.
Reviewer(s): Onana, J.-M.
Facilitator/Compiler(s): Lopez Poveda, L.
Described by Gilg in 1904 (German colonial period) from Conrau 10 collected in Nov. 1898 between Banti and Babesong at 600–700 m alt., this beautiful species is easily recognized by its diminutive size and its often purple-black leaf-blades which bear long, white, patent-curved hairs on their upper surfaces. It does not occur in a protected area and is unknown in cultivation. It appears restricted to pristine submontane forest areas along a short section of the western side of the Cameroon Highlands from northern Bakossi to Bamboutos Mts/Bamileke plateau. The nine collections recorded by Sosef (1994: 182) are immediately to the northeast (Nkongsamba-Mt Nlonako) or north (S and W Bamboutos Mts) of Kupe-Bakossi. Until we surveyed at Ngomboaku in 1999, recording three sites for the species in a fairly small area east of the village, B. pseudoviola was entirely unknown from Kupe-Bakossi despite a total of about 12 months of collection by teams totalling over 100 people over 4 years 1995-1999. Therefore even within intact submontane forest within its range, B. pseudoviola is rare and localized. Owing to its relatively low altitudinal range, B. pseudoviola is extremely vulnerable to forest clearance. Previously this species was assessed as Endangered under criterion B but but stated that it might be better assessed under criterion A (Onana and Cheek 2011). Earlier still it was assessed as Vulnerable (Cheek et al. 2004).  This species is assessed here as Endangered under criterion A2c on the basis that it has been lost from five (lower slopes northwest of Nlonako, Bare, the two Bamileke locations and at Mamfe-Bamenda near Bali) of its ten known locations due to habitat clearance for agricultural land and for urban expansion over the past sixty years (three generations). It has an area of occupancy of 48 km². The prognosis for further habitat destruction for this taxon is high. In 2009 observations at Lebialem proved the species to be extremely threatened west of the Bamboutos. However specimens from that location are slightly anomalous, having green not black leaves and having a lower altitudinal range (250-400 m) so need further scrutiny as they may represent a separate taxon. The species also qualifies for listing as Endangered under criterion B2, because the area of occupancy is between 34 and 64 km2, the species is now known from only five locations (was formerly ten) and there is continuing decline as described above and below.
Previously published Red List assessments:

Geographic Range [top]

Range Description:The species is a Cameroon endemic from the Southwest Region: Mone Forest Reserve; Lebialem/S Bamboutos Mts (six collections); Kupe-Bakossi (three collections), Mt Nlonako (three collections).
Countries occurrence:
Additional data:
Estimated area of occupancy (AOO) - km2:32-64,54Continuing decline in area of occupancy (AOO):Yes
Estimated extent of occurrence (EOO) - km2:5404
Number of Locations:5Continuing decline in number of locations:Yes
Lower elevation limit (metres):250
Upper elevation limit (metres):850
Range Map:Click here to open the map viewer and explore range.

Population [top]


Population size is not known but is declining due to loss of locations.

Current Population Trend:Decreasing
Additional data:
Continuing decline of mature individuals:Yes
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:It appears to be restricted to submontane forest areas along a short section of the Cameroon Highlands; occurring between (250-)600-850 m asl.
Continuing decline in area, extent and/or quality of habitat:Yes
Generation Length (years):20

Threats [top]

Major Threat(s): Due to its relatively low altitudinal range, B. pseudoviola is extremely vulnerable to forest clearance and urban expansion.

Conservation Actions [top]

Conservation Actions: The surviving sites need to be revisited to assess the population size, regeneration and threats to obtain baseline data for future monitoring. None of the known sites has formal protected status as far as is known, this should be addressed if possible.

Citation: Cheek, M. 2015. Begonia pseudoviola. The IUCN Red List of Threatened Species 2015: e.T45437A3002731. . Downloaded on 21 June 2018.
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