Maria Sibylla Merian
Maria Sibylla Merian (2 April 164713 January 1717) was a German-born naturalist and scientific illustrator, a descendant of the Frankfurt branch of the Swiss Merian family. Merian was one of the first naturalists to observe insects directly.
María Sabina
María Sabina (July 22, 1894 – November 22, 1985) was a Mazatec "curandera" who lived in the Sierra Mazateca of southern Mexico. Her practice was based on the use of psilocybin mushrooms, such as "Psilocybe mexicana".