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Scientific Name | Steirodiscus linearilobus DC. |
Higher Classification | Dicotyledons |
Family | ASTERACEAE |
Synonyms | Psilothonna schlechteri (Bolus ex Schltr.) E.Phillips, Steirodiscus schlechteri Bolus ex Schltr. |
National Status |
Status and Criteria | Critically Endangered B1ab(iii,v)+2ab(iii,v); C2a(ii) |
Assessment Date | 2015/09/20 |
Assessor(s) | N.A. Helme & L. von Staden |
Justification | One small, remaining subpopulation of about 200 plants, occupying an area of about one hectare is declining due to ongoing habitat loss and degradation. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Western Cape |
Range | Lower Olifants River Valley around Klawer and flats below Koebee Mountains east of Vanrhynsdorp. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Klawer Sandy Shrubland, Vanrhynsdorp Gannabosveld |
Description | Sandy flats in open shrubland. |
Threats |
| This species has declined in the past due to habitat loss to agricultural expansion. The only remaining location is threatened by habitat loss to development and overgrazing. |
Population |
A very rare and localized species, known historically from five locations, but remaining at only one due to habitat loss to agricultural expansion. The population consists of less than 200 plants within an area of about one hectare (N.A. Helme pers. obs.).
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Population trend | Decreasing |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Steirodiscus linearilobus DC. | CR B1ab(iii,v)+2ab(iii,v); C2a(ii) | 2017.1 | | Steirodiscus linearilobus DC. | Data Deficient | Raimondo et al. (2009) | | Steirodiscus schlechteri Bolus ex Schltr. | VU D2 | Raimondo et al. (2009) | | Steirodiscus schlechteri Bolus ex Schltr. | VU D2 | Victor (2002) | | Steirodiscus schlechteri Bolus ex Schltr. | Indeterminate | Hilton-Taylor (1996) | |
Bibliography |
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.
Harvey, W.H. 1894. Compositae. In: W.H. Harvey and O.W. Sonder (eds). Flora Capensis III (Rubiaceae to Campanulaceae):44-530. L. Reeve & Co., Ltd., Ashford.
Hilton-Taylor, C. 1996. Red data list of southern African plants. Strelitzia 4. South African National Botanical Institute, Pretoria.
Manning, J.C., Goldblatt, P. and Joubert, L. 2013. A taxonomic revision of the small Cape genus Steirodiscus (Asteraceae: Senecioneae). Bothalia 43(1):109-119.
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.
Victor, J.E. 2002. South Africa. In: J.S. Golding (ed), Southern African plant Red Data Lists. Southern African Botanical Diversity Network Report 14 (pp. 93-120), SABONET, Pretoria.
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Citation |
| Helme, N.A. & von Staden, L. 2015. Steirodiscus linearilobus DC. National Assessment: Red List of South African Plants version . Accessed on 2025/04/22 |
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