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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 & Goldblatt | VU D2 | 2014.1 | | Thereianthus montanus J.C.Manning & Goldblatt | Critically Rare | 2013.1 | | Thereianthus montanus J.C.Manning & Goldblatt | Critically Rare | Raimondo et al. (2009) | | Thereianthus montanus J.C.Manning & Goldblatt | Vulnerable | 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.
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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 . Accessed on 2025/01/21 |
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