Hally Delilia Mary Sax (née Jolivette; June 22, 1884 – March 20, 1979),[3][4] was an American botanist known for her work on the chromosomal structure of plant species and how it is affected by radiation and other mutagens.
She taught at the University of Wisconsin (1907–10), Stanford (1910–12), and Washington State College (1912–14).
While at the latter institution, she met and, in 1915, married the botanist Karl Sax, one of her cytology students.
[5] She worked for a year for the U.S. Department of Agriculture (1914–15) before taking up a position as an instructor of botany in 1916 at Wellesley College in Wellesley, Massachusetts.
[4] In 1966, she and Karl were co-recipients of the Mary Soper Pope Memorial Award in botany.