French botanist (1890–1972).
Raymond-Hamet (25 March 1890 – 2 October 1972) was a French botanist specializing in Crassulaceae. He published his first species description, of a Kalanchoe at the age of fifteen. At eighteen, he published a complete and thorough revision of that genus, and continued to work on the genus for the remainder of his life. He has been described as "the undisputed authority on Kalanchoe during the 20th century".