Marasmodes oubinae S.Ortiz
|Marasmodes adenosolen in the sense of Hutchinson (1916), not of Harv. (misapplied name), Marasmodes schlechteri Magee & J.C.Manning|
Status and Criteria
Critically Endangered B2ab(iii,v); C2a(i)
|I. Ebrahim, A.R. Magee & L. von Staden|
|Marasmodes oubinae remains in four small, isolated renosterveld remnants (AOO <1 km²) after 90% of its habitat was converted to crop fields. All subpopulations consist of fewer than 50 mature individuals, and the population is estimated to number fewer than 150 mature individuals. It continues to decline due to ongoing habitat degradation.|
|South African endemic|
|Eendekuil to Malmesbury.|
Habitat and Ecology
|Piketberg Quartz Succulent Shrubland, Swartland Shale Renosterveld, Swartland Granite Renosterveld, Boland Granite Fynbos|
|Gravelly transitional alluvial renosterveld-fynbos and quartz outcrops in shale renosterveld.|
|Expansion of crop cultivation in the Swartland has led to 90% loss of this species' renosterveld habitat. Only very small fragments that are unsuitable to cultivation remain. These however continue to be degraded due to overgrazing - small fragments are often overstocked with livestock, inappropriate fire management, spreading, unmanaged alien invasive plants, and recreational use of some sites for off-road driving. An application for gravel mining could cause the loss of one subpopulation if granted.|
Marasmodes oubinae is historically the most widespread species in the genus (its original EOO is 280 km²), but less than 10% of its habitat now remains intact. Four subpopulations are known to remain, with three occurring on small remnants of natural vegetation among extensive crop fields. Field surveys of all four subpopulations indicate that they are small, the largest consisting of 35 plants. The population is estimated to number fewer than 150 mature individuals, and continues to decline due to ongoing habitat degradation. The subpopulations are isolated, and all are small, and therefore the population is considered severely fragmented.
|Ortiz (2009) included collections from the eastern base of the Paardeberg near Malmesbury in M. oubinae, but upon revision of the material, these collections were found to belong to Marasmodes fasciculata (A.R. Magee pers. comm. 2016).|
Status and Criteria
Citation/Red List version
|Marasmodes oubinae S.Ortiz||EN B1ab(iii)+2ab(iii)||2012.1|
|Marasmodes sp. nov. (Manning 2747 PRE)||CR D||Raimondo et al. (2009)|
Magee, A.R. and Manning, J.C. 2010. Two new species of Asteraceae (tribe Anthemideae, subtribe Pentziinae) from the Cape Floristic Region of South Africa. South African Journal of Botany 76(2):279-284.
Magee, A.R., Ebrahim, I., Koopman, R., Raimondo, D. and Von Staden, L. In prep. Marasmodes (Asteraceae, Anthemideae), the most threatened plant genus of the Cape Floristic Region, South Africa.
Manning, J.C. and Goldblatt, P. 2012. Plants of the Greater Cape Floristic Region 1: The Core Cape Flora. Strelitzia 29. South African National Biodiversity Institute, Pretoria.
Ortiz, S. 2009. Eight new species of Marasmodes (Asteraceae, Anthemideae) from South Africa. Botanical Journal of the Linnean Society 159:330-342.
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.
|Ebrahim, I., Magee, A.R. & von Staden, L. 2016. Marasmodes oubinae S.Ortiz. National Assessment: Red List of South African Plants version 2017.1. Accessed on 2017/04/25|