Widowed in 1942, she traveled in 1950, to Abercorn,
Northern Rhodesia (now Mbala, Zambia), for a holiday with old friends who lived there. She requested equipment for collecting plants from Edgar Milne-Redhead at the Royal Botanic Gardens, Kew and vigorously began to collect herbarium specimens of African plants at the age of 65. She eventually settled in Zambia and collected about 27,000 herbarium specimens, including many new species and even new genera, including Richardsiella (Poaceae), which is named after her.[5] She eventually published a "Check List of the Flora of Mbala (Abercorn) and District" with W. V. Morony in 1969 but was uncomfortable with the political changes in the newly independent Zambia and moved to Tanzania, spending much time with conservationist Desmond Vesey-Fitzgerald near Arusha National Park.[2]
On the nomination of the first president of the independent Zambia, Dr. Kenneth Kaunda, Richards was appointed a Member of the Most Excellent Order of the British Empire. At age 89, she returned to Wales, where she died in 1977.[3] She continued to botanize until one week after her ninetieth birthday.[2]
On many of the labels of her plant specimens, she recorded herself as "Mrs. H. M. Richards" (for Mrs. Henry Meredyth Richards).
^Joy Harvey and Marilyn Ogilvie (1 January 2000). "Mary A. E. Richards". In Marilyn Ogilvie; Joy Harvey (eds.). The Biographical Dictionary of Women in Science. Vol. 2. New York and London: Routledge. p. 1097. ISBN978-0-415-92040-7.
^ abcCondry, William (1998). Wildflower Safari: The Life of Mary Richards. Llandysul, Ceredigion, Wales: Gomer Press. p. 16. ISBN1-85902-558-7.
^Benoit, Peter; Richards, Mary (1963). A Contribution to a Flora of Merioneth(PDF) (2 ed.). Haverfordwest: West Wales Naturalists' Trust. p. 69. Retrieved 31 July 2022.
