Scientific Name
Steirodiscus linearilobus DC.
Higher Classification
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
N.A. Helme & L. von Staden
One small, remaining subpopulation of about 200 plants, occupying an area of about one hectare is declining due to ongoing habitat loss and degradation.
South African endemic
Provincial distribution
Western Cape
Lower Olifants River Valley around Klawer and flats below Koebee Mountains east of Vanrhynsdorp.
Habitat and Ecology
Major system
Major habitats
Namaqualand Strandveld, Klawer Sandy Shrubland, Kobee Succulent Shrubland, Vanrhynsdorp Gannabosveld, Namaqualand Riviere
Sandy flats in open shrubland.
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.

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.).

Population trend
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 schlechteri Bolus ex Schltr.VU D2Raimondo et al. (2009)
Steirodiscus linearilobus DC.Data Deficient Raimondo et al. (2009)
Steirodiscus schlechteri Bolus ex Schltr.VU D2Victor (2002)
Steirodiscus schlechteri Bolus ex Schltr.Indeterminate Hilton-Taylor (1996)

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.

Helme, N.A. & von Staden, L. 2015. Steirodiscus linearilobus DC. National Assessment: Red List of South African Plants version 2020.1. Accessed on 2020/07/09

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Distribution map

© N.A. Helme

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