Among the numerous works of J.P. Lotsy Mrs. M.J. van Steenis-Kruseman (Fl. Mai. I, 1, 1950, 331a) cited ’Die Monocotylenflora von Java (1904)’ a citation derived from the biography of Lotsy by WA Goddijn (Genetica 13, 1931, xiv). It appears that after his stay in Java (1895—1900) Lotsy had decided to frame a work on the flowering plants of Java within the scheme ’Flore de Buitenzorg’ initiated by Melchior Treub. He started this probably in Leiden in 1900 still working on it until 1905. It would represent volume 7 of Treub’s work.