Gerstner's Aloe

Scientific Name
Aloe gerstneri Reynolds
Higher Classification
Common Names
Gerstner's Aloe (e), Isihlabana (z)
National Status
Status and Criteria
Vulnerable B1ab(i,ii,iii,v)
Assessment Date
J.E. Victor, E. van Wyk & G.F. Smith
Restricted range (EOO 111 km²) and known from seven locations. Declining in extent and habitat quality and in the number of mature individuals as a result of erosion caused by overgrazing and subsistence farming.
South African endemic
Provincial distribution
Babanango district.
Habitat and Ecology
Major system
Major habitats
KwaZulu-Natal Highland Thornveld
Thornveld, on rocky slopes and outcrops along streams, on quartz, but favouring granite, 900 m.
The known range of this species is severely degraded by extreme overgrazing and subsistence farming. According to NLC 1996, 65% of the known range of this species has undergone extreme degradation, but this is quite possibly an underestimate. Although this species seems to withstand heavy grazing and most historically known populations still persist, the overgrazing has been causing erosion of large areas, especially along the Nqutu-Babanango road (NLC 1996), and this will lead to the loss of individuals and populations (C.R. Scott-Shaw pers. comm.). According to Van Wyk and Smith (1996), there is an ongoing decline in the number of plants.
Population trend
Assessment History
Taxon assessed
Status and Criteria
Citation/Red List version
Aloe gerstneri ReynoldsVU B1ab(i,ii,iii,v)Raimondo et al. (2009)
Aloe gerstneri ReynoldsVU B1B2abceVictor (2002)
Aloe gerstneri ReynoldsVU B1B2abcdScott-Shaw (1999)
Aloe gerstneri ReynoldsRare Hilton-Taylor (1996)
Aloe gerstneri ReynoldsVulnerable Hall et al. (1980)

Glen, H.F. and Hardy, D.S. 1990. Aloe gerstneri. Flowering Plants of Africa 51(1):t.2008.

Glen, H.F. and Hardy, D.S. 2000. Aloaceae (First part): Aloe. In: G. Germishuizen (ed). Flora of Southern Africa 5 Part 1, Fascicle 1:1-159. National Botanical Institute, Pretoria.

Hall, A.V., De Winter, M., De Winter, B. and Van Oosterhout, S.A.M. 1980. Threatened plants of southern Africa. South African National Scienctific Programmes Report 45. CSIR, Pretoria.

Hilton-Taylor, C. 1996. Red data list of southern African plants. Strelitzia 4. South African National Botanical Institute, Pretoria.

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.

Reynolds, G.W. 1937. Two new aloes from Zululand and two from the Transvaal. Journal of South African Botany 3:133-141.

Reynolds, G.W. 1969. The Aloes of South Africa. A.A. Balkema, Cape Town.

Scott-Shaw, C.R. 1999. Rare and threatened plants of KwaZulu-Natal and neighbouring regions. KwaZulu-Natal Nature Conservation Service, Pietermaritzburg.

Van Wyk, B.-E. and Smith, G. 1996. Guide to the aloes of South Africa. Briza Publications, 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.

Victor, J.E., van Wyk, E. & Smith, G.F. 2004. Aloe gerstneri Reynolds. National Assessment: Red List of South African Plants version 2017.1. Accessed on 2019/05/26

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Distribution map

© L. Nkuna

© D.R. McKenzie

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