With the British reoccupation of the Cape, he settled at Plettenberg Bay in the Eastern Cape, collecting botanical specimens for Joseph Mackrill (1762-1820), a practitioner with a special interest in medicinal plants.
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Mackrill established a garden and trial ground for crops in Somerset East, occasionally sending herbarium material to the British Museum.
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Clemenz Heinrich Wehdemann (1762 Breda-Resa near Hanover - 25 September 1835 "Lichtenstein" near Bedford, Eastern Cape ), a German soldier, artist and naturalist arrived in the Cape Colony in the service of the Dutch East India Company in 1784, and was probably a member of the Württemberg Regiment.
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