Begonia schaeferi 


Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Magnoliopsida Cucurbitales Begoniaceae

Scientific Name: Begonia schaeferi
Species Authority: Engl.

Assessment Information [top]

Red List Category & Criteria: Near Threatened ver 3.1
Year Published: 2015
Date Assessed: 2015-07-13
Assessor(s): Cheek, M.
Reviewer(s): Onana, J.-M.
Facilitator/Compiler(s): Hilton-Taylor, C.
This yellow flowered herb has attractive bullate leaves. It is specific to shaded rock-faces. Even in well surveyed areas it is highly localized. Although first collected by Schaefer in Nov. 1900 at Bare, Mwanenguba in the Bakossi region, and described in 1921, it has not been refound there since, despite hundreds of botanists being active there under the Earthwatch scheme between 1995-2005. It may now be extinct in the Bakossi area.  Personal observations of B. schaeferi in the Bamenda Highlands (M. Cheek pers. obs. 1999-2002) shows that this species is demanding in its habitat requirements and likely to occur at extremely few sites within a given area (Cheek et al. 2000). The assessment of this species as Vulnerable in Cheek et al. (2000, 2004) is not maintained here because there are a number of new records from Cameroon and Gabon (all supposedly determined by Marc Sosef ) which greatly increase the extent of occurrence to 103,539 km2, and the minimum area of occupancy to 76 km2 and there are now about 14 locations. There is continuing decline in extent and quality of its habitat in places, so as a result this Begonia is assessed here as Near Threatened as it almost qualifies for a threatened listing under criterion B2ab(iii).
Previously published Red List assessments:
2004 Vulnerable (VU)
2000 Vulnerable (VU)

Geographic Range [top]

Range Description: Species recorded from Nigeria, Obudu Plateau (one collection); Cameroon: Mwanenguba, Kongoa Mts, Mt Nlonako (each one collection), Lebialem Highlands/Bamboutos Mts (three collections), Bamenda Highlands (three collections), Campo-Ma'an and a few additional new localities in Cameroon, and now it is also known from Gabon.
Countries occurrence:
Cameroon; Gabon; Nigeria
Estimated area of occupancy (AOO) - km2: 76
Number of Locations: 14
Lower elevation limit (metres): 1500
Upper elevation limit (metres): 2300
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: Population size is not known but is thought to be in decline. Only about 5-6 clumps of plants have been noted at those locations where this data has been recorded. However, given the increasing number of collections of this species, it may be commoner than previously thought.
Current Population Trend: Decreasing
Additional data:
Population severely fragmented: No

Habitat and Ecology [top]

Habitat and Ecology: Herbs that grows on rocks and vertical rock faces in moist to comparatively dry places in primary submontane to montane forest, the latter sometimes with trees not taller than 6-12 m; c. 1,500-2,300 m alt. (Sosef 1994).
Systems: Terrestrial
Continuing decline in area, extent and/or quality of habitat: Yes

Threats [top]

Major Threat(s): While cliff faces generally are unlikely to be disturbed except for extraction of rock aggregate for civil engineering, if easily accessible by road, clearance of adjoining forest for fuel and agriculture could endanger this species by removing the shade necessary for its survival.

Conservation Actions [top]

Conservation Actions: During surveys of cliff spaces (in forest) this species should be looked for and, if located, the number of plants and locality recorded as a baseline for future monitoring. It is not clear if it occurs in any existing protected areas.

Citation: Cheek, M. 2015. Begonia schaeferi. The IUCN Red List of Threatened Species 2015: e.T39728A2931608. . Downloaded on 29 November 2015.
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