Paul Constant Billot (12 March 1796 – 19 April 1863) was a French botanist born in Rambervillers.

He studied at the University of Strasbourg, subsequently leaving school due to illness. From 1830 he worked as a civil servant (conductor of ponts et chaussées), earning his bachelor's degree a few years later. From 1834 to 1861 he taught classes in physics and natural history in Haguenau.Billot - Jardin Botanique (biographical information)

With botanist Friedrich Wilhelm Schultz (1804–1876), he was co-author of Archives de la flore de France et d'Allemagne.WorldCat Titles (publications) Billot's Annotations a la flore de France et d'Allemagne (1855) was added by the distribution of the exsiccata series Flora Galliae et Germaniae exsiccata (1846-1861), a work which after his death in 1863 was continued by other scientists under the title Flora exsiccata de C. Billot, continué par V. Bavoux, A. Guichard, P. Guichard et J. Paillot or "Billotia".Open Library Annotations a la flore de France et d'allemagneGoogle Books (publications)Triebel, D. & Scholz, P. 2001–2024 IndExs – Index of Exsiccatae. – Botanische Staatssammlung München: http://indexs.botanischestaatssammlung.de. – München, Germany.

Today his herbarium is kept at the Muséum d'histoire naturelle in Nantes.GBIF France Consultation de la collection: herbier Billot, collection Dufour E.

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