Taxonomy
Scientific Name
Dierama tysonii N.E.Br.
Higher Classification
Monocotyledons
Family
IRIDACEAE
National Status
Status and Criteria
Vulnerable B1ab(ii,iii,iv,v)
Assessment Date
2015/05/19
Assessor(s)
H. Mtshali, C.R. Scott-Shaw & D. Raimondo
Justification
EOO 2024 km², known from 10 locations, this species has lost habitat to timber plantations and crop farming, and is currently declining mainly due to ongoing habitat degradation due to livestock overgrazing.
Distribution
Endemism
South African endemic
Provincial distribution
Eastern Cape, KwaZulu-Natal
Range
East Griqualand, between the Ngele and Swartberg Mountains.
Habitat and Ecology
Major system
Terrestrial
Major habitats
Midlands Mistbelt Grassland, Mabela Sandy Grassland, East Griqualand Grassland, Drakensberg Foothill Moist Grassland
Description
Montane grassland, 1300-1700 m.
Threats
At least 40% of the species' habitat has already been lost to timber plantations and rural settlements. There is ongoing habitat loss and degradation due to livestock overgrazing and commercial crop farming. It is also likely to be threatened by too irregular fires and invasive plants.
Population
Population trend
Decreasing
Assessment History
Taxon assessed
Status and Criteria
Citation/Red List version
Dierama tysonii N.E.Br.VU B1ab(ii,iii)Raimondo et al. (2009)
Dierama tysonii N.E.Br.Lower Risk - Least Concern Scott-Shaw (1999)
Dierama tysonii N.E.Br.Rare Hilton-Taylor (1996)
Bibliography

Hilliard, O.M. and Burtt, B.L. 1991. Dierama: The hairbells of Africa. Acorn Books, Johannesburg and London.


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.


Scott-Shaw, C.R. 1999. Rare and threatened plants of KwaZulu-Natal and neighbouring regions. KwaZulu-Natal Nature Conservation Service, Pietermaritzburg.


Citation
Mtshali, H., Scott-Shaw, C.R. & Raimondo, D. 2015. Dierama tysonii N.E.Br. National Assessment: Red List of South African Plants version 2020.1. Accessed on 2022/08/16

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Distribution map


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