Begonia pelargoniiflora 


Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Magnoliopsida Cucurbitales Begoniaceae

Scientific Name: Begonia pelargoniiflora
Species Authority: Wilde & J.C.Arends

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(iii)+2ab(iii) 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.
This species was described in 1992 and an updated account was included in de Wilde's revision of Begonia sect. Tetraphila (2002: 183). B. pelargoniiflora shows a similar disjunct distribution to that of B. furfuracea, i.e. Bioko, northwards to the Bakossi Mts but omitting the very well collected Mt Cameroon. However, whereas de Wilde records eight collections for B. furfuracea, there are only four known for B. pelargoniiflora, two from Bioko and one each from the Bakossi Mts and the adjoining Mt Nlonako. The fact that it has not been recollected in the last 10 years despite intensive botanical inventory work e.g. in Bakossi, illustrates that this species really is very rare. By comparison, 30 specimens of the related and similar B. longipetiolata were made between 1995-2003 in Kupe-Bakossi. The extent of occurrence for this species is 3,820 km² and it has an area of occupancy of just 12 km². The range was previously treated as being severely fragmented on the basis of its absence from Mt Cameroon and so it was assessed as Critically Endangered (Cheek et al. 2004, Cheek 2004). However, there is no evidence to support that the range is severely fragmented, hence it needs to be treated as occurring in three separate locations. Based on the small range, number of locations and a continuing decline in the extent and quality of habitat due to forest clearance activities this species is reassessed as Endangered. No additional data are available since the 2004 assessment.
Previously published Red List assessments:
2004 Critically Endangered (CR)

Geographic Range [top]

Range Description: Species known from Bioko, Equatorial Guinea (two collections at one location) and from Cameroon: Bakossi Mts (Southwest Region) and Mt Nlonako (Littoral Region) (one collection each).
Countries occurrence:
Cameroon; Equatorial Guinea (Bioko)
Estimated area of occupancy (AOO) - km2: 12
Number of Locations: 3
Lower elevation limit (metres): 1000
Upper elevation limit (metres): 1500
Range Map: Click here to open the map viewer and explore range.

Population [top]


The population size of B. pelargoniiflora is not known, but is thought to be decreasing.

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

Habitat and Ecology [top]

Habitat and Ecology: An epiphyte which grows at the base of trees in cloud forest between 1,000-1,500 m asl.
Systems: Terrestrial
Continuing decline in area, extent and/or quality of habitat: Yes

Threats [top]

Major Threat(s): The main threat is forest clearance for wood and agricultural expansion, e.g. ongoing at Mt Nlonako, the type locality. Reports, and observations on Google Earth (2011 imagery) show large areas of the lower slopes have been cleared for small holder agriculture and for firewood and timber for construction. These threats may also apply to the Bakossi locality which has been poorly localized. J.-M. Onana (pers. obs. in 2010) observed the species during an impact assessment between Bekoko (Bonaberi near Douala) and Nkongsamba for the reinforcement of the electricity line by AES Sonel (work done with ERM from the South Africa).

Conservation Actions [top]

Conservation Actions: An effort should be made to rediscover this taxon and to assess the size of the subpopulation and its demography in detail. In view of its rarity this species might be suitable for propagation and reintroduction in suitable localities. Both of the Cameroon localities are outside protected areas, but the locality on Bioko may fall within a protected area.

Citation: Cheek, M. 2015. Begonia pelargoniiflora. The IUCN Red List of Threatened Species 2015: e.T45436A3002650. . Downloaded on 29 November 2015.
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