Peter Francis Stevens is a British botanist born in 1944. He is a researcher at the Missouri Botanical Garden and professor of Biology of the University of Missouri?St. Louis. He is a member of the Angiosperm Phylogeny Group which created the APG, APG II and APG III systems. He maintains a web site, APweb, hosted by the Missouri Botanical Garden, which has been regularly updated since 2001, and is a useful source for the latest research in angiosperm phylogeny which follows the APG approach. The standard author abbreviation P.F.Stevens is used to indicate P. F. Stevens as the author when citing a botanical name. He has named dozens of species, mostly in the families Clusiaceae and Ericaceae, and he also described the genus Romnalda. 

January 1st, 1944 in (Age 80)