In 1879 Jenman moved to British Guiana where he was appointed as Government Botanist and Superintendent of the Botanical Gardens.
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He was superintendent of Castleton Botanical Garden, Jamaica from 1873 to 1879, and Government Botanist and superintendent of the Botanical Gardens in British Guiana (now Guyana) from 1879 to 1902.
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Castellani House, now the home of Guyana's National Art Gallery, was originally designed and built to be his official residence by the Maltese colonial architect Cesar Castellani.
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