Margaret Lilian Flockton (29 September 1861 Sussex – 12 August 1953 Sydney), was an Australian botanical artist, particularly noted for her illustrating of "The Forest Flora of New South Wales" (some 300 plates), "A Critical Revision of the Genus Eucalyptus" (88 plates), and the genus Opuntia, all by the botanist and forester, Joseph Henry Maiden. She was the first botanical illustrator at the Royal Botanic Gardens in Sydney.
Her early studies were at the South Kensington Schools in London, where, unusually, she was trained in lithography, and also Miss Gann's Life School. She emigrated to Australia in 1881, accompanied by her sister, Mrs Boulton, and were later joined by their parents, Francis and Isabel. Her first regular employment extending over 7 years, was as commercial artist for the Sydney firms of Gibbs, Shallard & Co. and S.T. Leigh. Since her father Francis was also an artist, it is not surprising that she dedicated her life to art and never married.
To teach art, she opened a studio in Victoria Chambers, Castlereagh Street in Sydney, while her home was at "Tulagi", 30 Kemp St. in Tennyson Point, a suburb of Sydney, where she died shortly before turning 92. Her work was exhibited with the Royal Art Society between 1894 and 1901, consisting of wildflower studies and still-life paintings. In 1895 her watercolour of waratahs was purchased by the Art Gallery of New South Wales.
She started work at the National Herbarium of the Royal Botanic Gardens, Sydney on 3 June 1901 at the rate of "2 shillings per hour" and was earning £330 per annum at her retirement. For 27 years, from age 40 to 67, she turned out botanical drawings of the highest quality, making use of a camera lucida. There are some 1000 of her illustrations in The Botanic Gardens Trust Archive.