Ynés Enriquetta Julietta Mexía (May 24, 1870 – July 12, 1938) was a Mexican-American botanist notable for her extensive collection of novel specimens of flora and plants originating from sites in Colombia, Mexico, and Peru. She discovered a new genus of Asteraceae, known after her as Mexianthus, and accumulated over 150,000 specimens for botanical study over the course of a career spanning 16 years braving ecologic challenges such as poisonous berries, dangerous terrain, bogs and earthquakes for the sake of her research.