Bijlia dilatata

Taxonomy
Scientific Name
Bijlia dilatata H.E.K.Hartmann
Higher Classification
Dicotyledons
Family
AIZOACEAE
Synonyms
Bijlia cana N.E.Br., Bolusanthemum tugwelliae (L.Bolus) Schwantes, Hereroa cana L.Bolus, Hereroa tugwelliae in sense of L.Bolus (1927, 1928), not of L.Bolus(1930)
National Status
Status and Criteria
Endangered B1ab(iii,v)+2ab(iii,v)
Assessment Date
2015/12/13
Assessor(s)
S.J. Milton & L. von Staden
Justification
A range-restricted species (EOO 260 km²), occurring at three to five locations and declining due to ongoing habitat loss and degradation.
Distribution
Endemism
South African endemic
Provincial distribution
Western Cape
Range
Prince Albert.
Habitat and Ecology
Major system
Terrestrial
Major habitats
Prince Albert Succulent Karoo, Southern Karoo Riviere
Description
Flat areas covered by decomposed dolerite and quartzitic pebbles.
Threats
This species is predominantly threatened by grazing. Field studies have shown a 75% decrease in plant density in grazed areas, and that plant density remains low even after areas have been left ungrazed for 15 years (S.J. Milton, unpublished data). This species relies on nurse-effects of larger shrubs to survive and reproduce, and in areas where overgrazing has reduced shrub cover, plants in exposed localities die off in years of drought. Road construction, borrow pits, erosion and urban expansion are also causing ongoing habitat loss around Prince Albert.
Population

This species is declining across its range due to habitat loss and degradation, except for a 120 ha private nature reserve established to protect part of the population.


Population trend
Decreasing
Assessment History
Taxon assessed
Status and Criteria
Citation/Red List version
Bijlia dilatata H.E.K.HartmannLeast Concern Raimondo et al. (2009)
Bibliography

Hartmann, H.E.K. 1992. A new name for Bijlia cana (Mesembryanthema). Cactus and Succulent Journal (USA) 64(4):173-180.


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.


Citation
Milton, S.J. & von Staden, L. 2015. Bijlia dilatata H.E.K.Hartmann. National Assessment: Red List of South African Plants version 2017.1. Accessed on 2017/03/23

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Distribution map

© S.J. Milton


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