|
Scientific Name | Tylecodon bayeri Van Jaarsv. |
Higher Classification | Dicotyledons |
Family | CRASSULACEAE |
National Status |
Status and Criteria | Vulnerable D2 |
Assessment Date | 2015/05/12 |
Assessor(s) | E.J. van Jaarsveld & L. von Staden |
Justification | A localized species (EOO 424 km²), known from five locations and potentially threatened by habitat degradation due to overgrazing. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Northern Cape |
Range | Richtersveld, mountains between Eksteenfontein and Steinkopf. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Kosiesberg Succulent Shrubland, Rooiberg Quartz Vygieveld, Kahams Mountain Desert |
Description | Sheltered among rocks and shrubs on south-facing slopes. |
Threats |
| This species occurs in montane areas where the grazing pressure is currently low. However, as rangelands on the plains and closer to settlements are becoming increasingly degraded, herders are starting to move into montane areas in search of better grazing for their livestock. Severe overgrazing has caused a loss of vegetation cover and a decline in succulents dependent on nurse-shrubs elsewhere in the Richtersveld, and could potentially have a negative impact on this species as well. |
Population |
This species is known from only a few records, but is easily overlooked, and fairly common within suitable habitat (E.J. van Jaarsveld pers. comm.).
|
Population trend | Stable |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Tylecodon bayeri Van Jaarsv. | VU D2 | 2015.1 | | Tylecodon bayeri Van Jaarsv. | Least Concern | Raimondo et al. (2009) | | Tylecodon bayeri Van Jaarsv. | Rare | Hilton-Taylor (1996) | |
Bibliography |
Hilton-Taylor, C. 1996. Red data list of southern African plants. Strelitzia 4. South African National Botanical Institute, Pretoria.
Raimondo, D., von Staden, L., Foden, W., Victor, J.E., Helme, N.A., Turner, R.C., Kamundi, D.A. and Manyama, P.A. 2009. Red List of South African Plants. Strelitzia 25. South African National Biodiversity Institute, Pretoria.
Snijman, D.A. 2013. Plants of the Greater Cape Floristic Region 2: The extra Cape flora. Strelitzia 30. South African National Biodiversity Institute, Pretoria.
Van Jaarsveld, E. 1988. Tylecodon bayeri (Crassulaceae), a new species from the north western Cape. Aloe 25(2):30-32.
Van Jaarsveld, E.J. and Koutnik, D. 2004. Cotyledon and Tylecodon. Umdaus Press, Pretoria.
|
Citation |
| van Jaarsveld, E.J. & von Staden, L. 2015. Tylecodon bayeri Van Jaarsv. National Assessment: Red List of South African Plants version . Accessed on 2025/04/14 |
Comment on this assessment
