French priest and naturalist who spent most of his life in Chile. Jaffuel arrived in Chile as a young novice, continuing to study in Los Perales, Atacama. Alongside his religious work, Jaffuel was an enthusiastic naturalist and collected plants and insects in Chile and Bolivia. He published numerous monographs in the Revista Chilena de Historia Natural and was one of the founders of the Entomological Society of Chile. Among his expeditions were two trips to Bolivia between 1922 and 1924, to Kala Uyu (15 km north of La Paz) and Mururata, collecting at an altitude of 4,500-5,000 meters in each place. He found many mosses which he brought to the attention of his correspondent and friend, the bryologist I. Theriot. He also travelled to Easter Island in 1927 and returned to France in 1939, where he died. Taxa named after him include Gymnachne jaffuelii Parodi, Heliotropium jaffuelii I.M. Johnst. and Senecio jaffuelii Cabrera.