Haworthia parksiana

Taxonomy
Scientific Name
Haworthia parksiana Poelln.
Higher Classification
Monocotyledons
Family
ASPHODELACEAE
National Status
Status and Criteria
Critically Endangered A2acd
Assessment Date
2012/09/20
Assessor(s)
J.H. Vlok & D. Raimondo
Justification
EOO 35 km², AOO <2 km², only a few small subpopulations remain in the Mossel Bay region after more than 80% population decline due to urban development, road construction and alien plant invasion over the past 70 years (generation length 30 years). There is also a severe, ongoing threat from plant collecting.
Distribution
Endemism
South African endemic
Provincial distribution
Western Cape
Range
Great Brak River to Mossel Bay.
Habitat and Ecology
Major system
Terrestrial
Major habitats
Garden Route Granite Fynbos, Groot Brak Dune Strandveld
Description
Renosterveld with karroid elements, in sandy soil, completely under the protection of small shrubs, well hidden in fallen leaf debris or among moss and lichen.
Threats
Subpopulations around Groot Brak have been lost due to urban development and alien encroachment over the past 70 years. There is also a severe decline in the number of mature individuals as a result of plant collecting, which has resulted in an overall population decline of more than 80% in the past three generations. Collectors target this species as it is very slow growing, even in cultivation. One subpopulation was destroyed by the construction of the Southern Cape coastal road.
Population
Population trend
Decreasing
Assessment History
Taxon assessed
Status and Criteria
Citation/Red List version
Haworthia parksiana Poelln.CR A2acd; B1ab(ii,iii,iv,v)+2ab(ii,iii,iv,v)Raimondo et al. (2009)
Haworthia parksiana Poelln.Endangered Hilton-Taylor (1996)
Bibliography

Bayer, M.B. 1982. The new Haworthia handbook. National Botanical Gardens of South Africa.


Bayer, M.B. 1999. Haworthia Revisited: A revision of the genus. Umdaus Press, Hatfield.


Craib, C. 1990. Some rare Haworthias in South Africa. Aloe 27:23-26.


Goldblatt, P. and Manning, J.C. 2000. Cape Plants: A conspectus of the Cape Flora of South Africa. Strelitzia 9. National Botanical Institute, Cape Town.


Hilton-Taylor, C. 1996. Red data list of southern African plants. Strelitzia 4. South African National Botanical Institute, Pretoria.


Pilbeam, J.W. 1983. Haworthia and Astroloba, a collector's guide. B.T. Batsford Ltd., London.


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.


Scott, C.L. 1985. The genus Haworthia, a taxonomic revision. Aloe Books, Johannesburg.


Citation
Vlok, J.H. & Raimondo, D. 2012. Haworthia parksiana Poelln. National Assessment: Red List of South African Plants version 2017.1. Accessed on 2018/12/19

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Distribution map


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