Thistle Yolette Harris (born 29 July 1902 and died 5 July 1990), also known as Thistle Stead, was an Australian botanist, educator, author and conservationist.
According to John Walter, her interest in Australian plants was also developed when she met Albert Morris (1886-1939) while she taught at the school in Broken Hill between 1929 and 1930.
In 1951 she married pioneer conservationist and marine biologist David Stead, to whom she had been introduced by Le Plastrier in 1918 when she was sixteen. By marying Stead she became the second stepmother to the Australian novelist and short-story writer, Christina Stead.


Wild Flowers of Australia by Thistle Y. Harris