|
Scientific Name | Tritonia flabellifolia (D.Delaroche) G.J.Lewis |
Higher Classification | Monocotyledons |
Family | IRIDACEAE |
Synonyms | Acidanthera capensis (Houtt.) Baker (in part), Acidanthera flabellifolia (D.Delaroche) N.E.Br., Gladiolus flavus Aiton, Gladiolus roseus Jacq., Ixia falbellifolia D.Delaroche, Ixia tubulosa Burm.f. (in part), Montbretia capensis (Houtt.) Voigt (in part), Montbretia rosea (Jacq.) Voigt, Tritonia capensis (Houtt.) Ker Gawl. var. minor Ker Gawl., Tritonia flabellifolia (D.Delaroche) G.J.Lewis var. flabellifolia, Tritonia flabellifolia (D.Delaroche) G.J.Lewis var. major (Ker Gawl.) M.P.de Vos, Tritonia flabellifolia (D.Delaroche) G.J.Lewis var. thomasiae M.P.de Vos, Tritonia flava (Aiton) Ker Gawl., Tritonia rosea (Jacq.) Aiton |
National Status |
Status and Criteria | Near Threatened B2b(iii,v) |
Assessment Date | 2023/05/19 |
Assessor(s) | N.N. Mhlongo |
Justification | This species has an area of occupancy (AOO) of 124 km² and is known from between 25-30 fragmented locations. It has lost suitable habitat to infrastructural development and agriculture, and its habitat continues to decline due to spreading alien invasive species, grazing livestock and inappropriate fire management. With the population declining but with more than 10 locations extant it almost reaches the threshold for listing as Vulnerable under criterion B and is assessed as Near Threatened. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Western Cape |
Range | This species is endemic to the southern coastal districts of Western Cape, South Africa, from Botrivier and the lower northern and southern slopes of the Riviersonderend Mountains to Bredasdorp and across the coastal plain south of the Langberg as far east as Riversdale. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Elim Ferricrete Fynbos, Hangklip Sand Fynbos |
Description | It grows on stony clay slopes and shale outcrops in renosterveld or transitional fynbos vegetation. |
Threats |
| About 70% (calculated using GIS) of this species' habitat has been irreversibly transformed into wheat farms, particularly in the Overberg region. This transformation occurred mainly in the 1950s and 1960s. Subpopulations on the slopes of the Riviersonderend and Langeberg Mountains are threatened by spreading alien invasive plants.
Subpopulations around Bontebok Nature Reserve, and between Hawston and Bot River, are severely threatened by infrastructure developments. The remaining fragments of this species' habitat continue to be lost and degraded due to overgrazing and inappropriate fire management. |
Population |
Despite a loss of habitat to agriculture and declining habitat quality, this species still persists in between 25 and 30 subpopulations.
|
Population trend | Decreasing |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Tritonia flabellifolia (D.Delaroche) G.J.Lewis var. thomasiae M.P.de Vos | Critically Endangered (Possibly Extinct) | Raimondo et al. (2009) | | Tritonia flabellifolia (D.Delaroche) G.J.Lewis var. major (Ker Gawl.) M.P.de Vos | Least Concern | Raimondo et al. (2009) | | Tritonia flabellifolia (D.Delaroche) G.J.Lewis var. flabellifolia | Least Concern | Raimondo et al. (2009) | | Tritonia flabellifolia (D.Delaroche) G.J.Lewis var. thomasiae M.P.de Vos | Rare | Hilton-Taylor (1996) | |
Bibliography |
De Vos, M.P. 1983. The African genus Tritonia Ker Gawler (Iridaceae): Part II. Sections Subcallosae and Montbretia. Journal of South African Botany 49:347-422.
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.
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.
Goldblatt, P. and Manning, J.C. 2020. Iridaceae of southern Africa. Strelitzia 42. South African National Biodiversity 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.
|
Citation |
| Mhlongo, N.N. 2023. Tritonia flabellifolia (D.Delaroche) G.J.Lewis. National Assessment: Red List of South African Plants version . Accessed on 2024/12/06 |
Comment on this assessment
