Colonial History Board Sources:

Science and Colonial Expansion, The Role of the British Royal Botanic Gardens, Lucile H. Brockway (1979).

The following articles give insight into how Botanical Gardens helped to form the British Empire:

How botanical gardens helped to establish the British Empire | Financial Times (ft.com)

COLONIAL GARDENS AND COLLECTIONS — Center for Plants & Culture (plantsandculture.org)

The Guardian view on botanical gardens: inextricably linked to empire | Editorial | The Guardian

How Victorian plant hunters shaped British gardens | Kew

Robert Marnock’s plant catalogue provides us with evidence these exotic plants were housed in Sheffield Botanical Gardens. To take a look, see:

Sheffield Botanical Gardens: A History, Vol.1,1826-1844.