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Hamilton's Silver Sugarbush

Taxonomy
Scientific Name
Protea roupelliae Meisn. subsp. hamiltonii Beard ex Rourke
Higher Classification
Dicotyledons
Family
PROTEACEAE
Common Names
Hamilton's Silver Sugarbush (e)
National Status
Status and Criteria
Critically Endangered A2ac; B1ab(i,ii,iii,iv,v)+2ab(i,ii,iii,iv,v)
Assessment Date
2016/07/04
Assessor(s)
A.G. Rebelo, N.A. Helme, P.M. Holmes, C.N. Forshaw, S.H. Richardson, D. Raimondo, D.I.W. Euston-Brown, J.E. Victor, W. Foden, I. Ebrahim, B. Bomhard, E.G.H. Oliver, A. Johns, J. van der Venter, R. van der Walt, C. von Witt, A.B. Low, C. Paterson-Jones, J.P. Rourke, A.N. Hitchcock, L. Potter, J.H. Vlok & D. Pillay
Justification
One subpopulation remains within an EOO of 27 km² and AOO of ± 1 km². Two of the three known subpopulations are now extinct. The single remaining subpopulation numbers fewer than 1000 mature individuals. Ongoing threats include afforestation, alien plant invasion, water table depletion and transformation of surrounding vegetation, too infrequent fire, altered drainage as a result of road construction and canalization, and overgrazing.
Distribution
Endemism
South African endemic
Provincial distribution
Mpumalanga
Range
Barberton.
Habitat and Ecology
Major system
Terrestrial
Major habitats
Barberton Montane Grassland, Legogote Sour Bushveld
Description
Confined to Barberton montane grassland.
Threats
Threats include: afforestation (pines), alien (pines) species causing water table depletion, alien landscape transformation (acidification is occurring and plants may have and intolerance, thus, making them look sick and causing high mortality and a low seed bank), too-infrequent fire in grasslands, canalization and altered drainage (by roads), road building (through the remnant population), alien invasive species (Pinus, Bugweed and Bramble), agricultural preparation (deep ripping through the remnant to establish pines), overgrazing (by common duiker, Sylvicarpa grimmia).
Population

Some 180 plants were counted in 2002 (Schmidt et al. 2002). The subpopulation is not setting seed, therefore, fires would be have an adverse effect, however, they appear senescent and may require a fire for recruitment. A follow-up count in 2015 recorded a healthy population of at least 670 plants, with many seedlings (B. du Preez pers. comm. 2015).


Population trend
Decreasing
Citation
Rebelo, A.G., Helme, N.A., Holmes, P.M., Forshaw, C.N., Richardson, S.H., Raimondo, D., Euston-Brown, D.I.W., Victor, J.E., Foden, W., Ebrahim, I., Bomhard, B., Oliver, E.G.H., Johns, A., van der Venter, J., van der Walt, R., von Witt, C., Low, A.B., Paterson-Jones, C., Rourke, J.P., Hitchcock, A.N., Potter, L., Vlok, J.H. & Pillay, D. 2016. Protea roupelliae Meisn. subsp. hamiltonii Beard ex Rourke. National Assessment: Red List of South African Plants version 2017.1. Accessed on 2019/12/06

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Distribution map


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