Tölken, H. R., Botanical Research Institute, Department of Agricultural Technical Services, South Africa
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Vol 12, No 2 (1977) - Original Research
New taxa and a new combination in the genus Cotyledon
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Vol 12, No 4 (1979) - Original Research
A re-evaluation of the Cotyledon orbiculata Complex
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Vol 12, No 3 (1978) - Original Research
New taxa and new combinations in Cotyledon and allied genera
Abstract PDF