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Scientific Name | Euphorbia susannae Marloth |
Higher Classification | Dicotyledons |
Family | EUPHORBIACEAE |
Common Names | Knoppiesnoors (a) |
National Status |
Status and Criteria | Endangered B1ab(iii,v)+2ab(iii,v) |
Assessment Date | 2022/05/09 |
Assessor(s) | J.H. Vlok & D. Raimondo |
Justification | This species has a limited distribution range and has an extent of occurrence (EOO) of 149 km² and an area of occupancy (AOO) of 40 km². Known from four locations, it is declining due to illegal collection to supply the specialist succulent trade as well as habitat degradation due to trampling and overgrazing. It therefore qualifies as Endangered under criterion B. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Western Cape |
Range | This species is endemic to the Western Cape province, where it occurs east of Barrydale and extends to Muiskraal. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Little Karoo Quartz Vygieveld |
Description | Plants grow on flat to gentle slopes, often in quartz patches in the karroid scrub. |
Threats |
This attractive but slow growing species continues to decline due to illegal removal of wild plants for the succulent trade. Overgrazing and trampling by livestock is also affecting parts of this species' habitat. |
Population |
it is known from a small collection and is not common. There are at least four subpopulations. The population size is unknown. However, it continues to decline due to pressures from the illegal wild plant trade and habitat destruction.
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Population trend | Decreasing |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | Euphorbia susannae Marloth | EN B1ab(iii,v)+2ab(iii,v) | Raimondo et al. (2009) | |
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.
Manning, J. and Ebrahim, I. Flame lilies and Christmas Bells: the genera Gloriosa L. and Sandersonia Hook. (Colchicaceae: Colchiceae) in southern Africa.
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.
Vlok, J. and Schutte-Vlok, A.L. 2010. Plants of the Klein Karoo. Umdaus Press, Hatfield.
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Citation |
Vlok, J.H. & Raimondo, D. 2022. Euphorbia susannae Marloth. National Assessment: Red List of South African Plants version . Accessed on 2025/02/18 |