Taxonomy
Scientific Name
Osteospermum hispidum Harv. var. hispidum
Higher Classification
Dicotyledons
Family
ASTERACEAE
National Status
Status and Criteria
Vulnerable B1ab(i,ii,iii,iv,v)
Assessment Date
2012/11/14
Assessor(s)
L. von Staden
Justification
EOO 366-2859 km², between four and seven locations continue to decline due to ongoing habitat loss to infrastructure development, competition from alien invasive plants and agricultural expansion.
Distribution
Endemism
South African endemic
Provincial distribution
Western Cape
Range
Caledon, Riviersonderend Mountains and Langeberg near Swellendam.
Habitat and Ecology
Major system
Terrestrial
Major habitats
South Langeberg Sandstone Fynbos, South Sonderend Sandstone Fynbos, Overberg Sandstone Fynbos, Greyton Shale Fynbos, Elim Ferricrete Fynbos, Swellendam Silcrete Fynbos
Description
Sandstone-shale ecotone on lower slopes in the Caledon area, and shaded areas in forest around Swellendam.
Threats
Plants in the Caledon area are threatened by ongoing habitat loss to development as well as competition from dense, unmanaged alien invasive plants. A subpopulation known from a 1929 collection from similar habitat on the southern foot of the Riviersonderend Mountains is very likely locally extinct due to habitat loss to crop cultivation and competition from alien invasive plants. Old records with vague locality information indicate that this species may also occur further south towards the Kleinrivier and Bredasdorp Mountains, where it is also likely to be threatened by ongoing habitat loss to crop cultivation. The subpopulation on the southern slopes of the Langeberg occurs within protected areas and is not threatened.
Population

An extremely rare and poorly known taxon, most historical collections are from Caledon, where it was also recorded in 2006 and 2009, as locally common within small areas of remnant natural vegetation on the foot of the Caledon Swartberg. Other records are from isolated, disjunct areas further south towards Napier, where it was last recorded in 1953, and eastwards to the Langeberg, where it was last recorded in 1952.


Population trend
Decreasing
Notes
Norlindh (1943) included one specimen from Grootvadersbos forest on the southern slopes of the Langeberg with O. hispidum var. hispidum, but remarked that this collection is not especially characteristic of the taxon. One other collection from indigenous forests in the adjacent Marloth Nature Reserve is known, but these remain disjunct from the Caledon collections, and together with major habitat differences, point to a possible unrecognized separate taxon. Should O. hispidum var. hispidum be confirmed to be restricted to the Caledon area, it will meet the criteria for the category Endangered.
Assessment History
Taxon assessed
Status and Criteria
Citation/Red List version
Osteospermum hispidum Harv. var. hispidum Threatened 2012.1
Osteospermum hispidum Harv. var. hispidum Threatened Raimondo et al. (2009)
Bibliography

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.


Norlindh, T. 1943. Studies in the Calenduleae. 1: Monograph of the genera Dimorphotheca, Castalis, Osteospermum, Gibbaria and Chrysanthemoides. Gleerup, Lund.


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
von Staden, L. 2012. Osteospermum hispidum Harv. var. hispidum. National Assessment: Red List of South African Plants version 2020.1. Accessed on 2022/05/20

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Distribution map

© N.A. Helme


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