Taxonomy
Scientific Name
Tritonia tugwelliae L.Bolus
Higher Classification
Monocotyledons
Family
IRIDACEAE
National Status
Status and Criteria
Least Concern
Assessment Date
2020/01/15
Assessor(s)
P. Goldblatt, J.C. Manning & D. Raimondo
Justification
Tritonia tugwelliae is confined to the southern parts of the Great Karoo, with an Extent of Occurrence (EOO) of 5046 km². Although known from fewer than 10 localities, this species is highly likely to be undercollected and we suspect that more than 15 subpopulations exist. It is not subject to any severe threats, and is therefore considered neither threatened or rare.
Distribution
Endemism
South African endemic
Provincial distribution
Western Cape
Range
This species is endemic to Western Cape Province, South Africa, where it occurs between Prince Albert, Leeu-Gamka and Laingsburg.
Habitat and Ecology
Major system
Terrestrial
Major habitats
Nama Karoo
Description
Deep loamy-sand in Nama Karoo shrubland.
Threats
No threats known.
Population

Two of the recorded thirteen subpopulations have information about the size of the subpopulations. Both record that plants are rare occurring in stands of fewer than 20 plants. However further surveys are required to confirm this species always occurs as small subpopulations. Ongoing decline to the population is inferred from habitat degradation due to livestock overgrazing.


Population trend
Stable
Assessment History
Taxon assessed
Status and Criteria
Citation/Red List version
Tritonia tugwelliae L.BolusLeast Concern Raimondo et al. (2009)
Tritonia tugwelliae L.BolusRare Hilton-Taylor (1996)
Bibliography

De Vos, M.P. 1999. Tritonia. In: O.A. Leistner (ed). Flora of Southern Africa 7 Iridaceae Part 2: Ixioideae, Fascicle 1: Ixieae:89-128. National Botanical Institute, Pretoria.


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.


Citation
Goldblatt, P., Manning, J.C. & Raimondo, D. 2020. Tritonia tugwelliae L.Bolus. National Assessment: Red List of South African Plants version 2020.1. Accessed on 2021/09/19

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Distribution map


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