• ''L'évolution régressive en biologie et en sociologie'', 1897, with Jean Demoor and
Emile Vandervelde, later translated into English by Mrs. Chalmers Mitchell and published as "Evolution by atrophy in biology and sociology" (1899). • ''Recueil de l'Institut botanique Léo Errera'', 1902 – Collections at the botanical institute of
Leo Errera. •
Un jardin botanique pour les écoles moyennes, 1902 – A botanical garden for middle schools. •
Essai de géographie botanique des districts littoraux et alluviaux de la Belgique, 1908 – Essay on phytogeography of the littoral and alluvial districts of Belgium. •
Esquisse de la géographie botanique de la Belgique, 1910 – Outline of Belgian phytogeography. •
Nos arbres, 1911 – Our trees. == References ==