Étienne Marcellin Granié-Blanc,[2] religious name Frère Sennen (1861–1937), was a French botanist and member (Brother) of the Catholic order Frères des écoles chrétiennes.
[4] Based for many years at the École Chrétiennes de Beziers in southern France, Frère Sennen collected a vast number of botanical specimens in the Languedoc.
[3] At the Instituto Botánico de Barcelona, one of the main preserved historical herbaria is that of Frère Sennen.
[7] Barcelona's Colegio La Salle Bonanova [es] contains a herbarium with about 40,000 specimens collected by Sennen.
When the Spanish Revolution of 1936 began, he left Spain and settled in Marseille, dying there suddenly in January 1937.