Legacy
Walter Lewis over the years of his research was awarded the following honors:
- Guggenheim Fellowship, 1963
- DuPont Fellowship, 1953
- Fellow of the Linnean Society of London, 1983
- Fellow of the Royal Geographical Society, London, 1987
- Martin de la Cruz Silver Medal (Mexican Academy of Traditional Medicine), 2000
- Janaki-Ammal Medal (Indian Ethnobotany Society), 2004 [1]