Begonia duncan-thomasii 


Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Magnoliopsida Cucurbitales Begoniaceae

Scientific Name: Begonia duncan-thomasii
Species Authority: Sosef

Assessment Information [top]

Red List Category & Criteria: Vulnerable B1ab(iii)+2ab(iii) ver 3.1
Year Published: 2014
Date Assessed: 2011-03-25
Assessor(s): Cheek, M.
Reviewer(s): Onana, J.-M.
Facilitator/Compiler(s): Lopez Poveda, L.
Begonia duncan-thomasii is a yellow-flowered herb specific to the submontane (cloud) forest of the Rumpi Hills and Kupe-Bakossi areas, where it is rare. Described by Sosef in 1992 it was then known only from four collections (Sosef 1994: 156), all but one of which are in Kupe-Bakossi, the exception being Satabie 259 from the Rumpi Hills; the remainder were collected by Duncan Thomas. These three sites are at the summit and on the west side of Mt Kupe, and west of Bangem. To these in 1998, we have added only two more collections from a fifth site, near Kodmin at Abo'h (Biye 31 and Etuge 4025). The conservation assessment of this species in Cheek et al. (2004) was Vulnerable B2ab(iii). It is assessed here as Vulnerable because it has an extent of occurrence of 1,054 km2, an area of occupancy of 28 km2, is known from seven locations and there is continuing decline in the extent and quality of the habitat due to a variety of threats (see below).
Previously published Red List assessments:
2004 Vulnerable (VU)

Geographic Range [top]

Range Description: Species endemic to Cameroon: Bakossi tribal area (that includes Kupe Mt., Bakossi Mts and Mwanenguba Mts.) and Rumpi Hills.
Countries occurrence:
Estimated area of occupancy (AOO) - km2: 28
Number of Locations: 7
Lower elevation limit (metres): 800
Upper elevation limit (metres): 2000
Range Map: Click here to open the map viewer and explore range.

Population [top]


Population size is not known but is thought to be in decline.

Current Population Trend: Decreasing
Additional data:
Population severely fragmented: No

Habitat and Ecology [top]

Habitat and Ecology: Begonia duncan-thomasii appears to be restricted to shady, damp, vertical rock-faces in forest, sometimes with the rare Nodonema lineatum; 800-2,000 m alt.
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: The sites of this species merit revisiting and regular monitoring for numbers of individuals, regeneration levels and threats.

Citation: Cheek, M. 2014. Begonia duncan-thomasii. The IUCN Red List of Threatened Species 2014: e.T45434A3002506. . Downloaded on 26 November 2015.
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