Taxonomy
Scientific Name
Thereianthus montanus J.C.Manning & Goldblatt
Higher Classification
Monocotyledons
Family
IRIDACEAE
National Status
Status and Criteria
Vulnerable D2
Assessment Date
2014/04/24
Assessor(s)
N.A. Helme, D. Raimondo & L. von Staden
Justification
A localized species (EOO 14 km²), known from two locations and potentially threatened by competition from alien invasive plants.
Distribution
Endemism
South African endemic
Provincial distribution
Western Cape
Range
Riviersonderend Mountains.
Habitat and Ecology
Major system
Terrestrial
Major habitats
South Sonderend Sandstone Fynbos
Description
Short, grassy fynbos on steep, moist, south-facing slopes, 1500 m.
Threats
The lower south-facing slopes of the Riviersonderend Mountains are densely infested with alien invasive pines escaping from timber plantations, and are steadily spreading upwards. At one known location, scattered pine trees are already present within 1 km of the subpopulation, and could potentially outcompete individuals if left unmanaged. A second subpopulation, about 12 km away along the same mountain range, is still free from alien plants, but high density stands are present on the foot slopes below.
Population
Population trend
Stable
Assessment History
Taxon assessed
Status and Criteria
Citation/Red List version
Thereianthus montanus J.C.Manning & GoldblattVU D22014.1
Thereianthus montanus J.C.Manning & GoldblattCritically Rare 2013.1
Thereianthus montanus J.C.Manning & GoldblattCritically Rare Raimondo et al. (2009)
Thereianthus montanus J.C.Manning & GoldblattVulnerable Hilton-Taylor (1996)
Bibliography

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


Manning, J.C. and Goldblatt, P. 2011. Taxonomic revision of the genus Thereianthus (Iridaceae: Crocoideae). Bothalia 41(2):239-267.


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.


Citation
Helme, N.A., Raimondo, D. & von Staden, L. 2014. Thereianthus montanus J.C.Manning & Goldblatt. National Assessment: Red List of South African Plants version 2020.1. Accessed on 2021/09/21

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Distribution map


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