Observations sur la flore cryptogamique de la Scandinavie
Sur la distribution des végétaux dans la region moyenne de la presqu’ile Scandinave (both with Charles Flahault 1879)
He became assistant professor, later full professor, of botany at Sorbonne in 1887 and, in addition, he founded a Plant Biological Laboratory in Fontainebleau in 1889. The same year, he co-founded the scientific journalRevue Générale de Botanique, which he edited until 1922. He was an early exponent of experimental plant ecology. He transplanted alpine plants between the Alps and Pyrenees and the research garden in Fontainebleau. The results were published in:
Nouvelle flore du Nord de la France et de la Belgique pour la détermination facile des plantes sans mots techniques. Vol. I. Tableaux synoptiques des plantes vasculaires de la flore de la France. P. Dupont, Paris, 1894 (With Georges de Layens (1834-1897)).
Vol. II. Nouvelle Flore des mousses et des hépatiques with Charles Isidore Douin (1858-1944). P. Dupont, Paris, 1895.
Vol. III. Nouvelle Flore des champignons with Julien Noël Costantin (1857-1936) and Léon Marie Dufour (1862-1942). P. Dupont, Paris, 1895.
Flore complète illustrée de France, Suisse et Belgique. (1911).