Map 3. Distribution of the genus Horsfieldia Willd. I = sect. Horsfieldia; II = sect. Irya, east of Wallace's Line (broken line); III = sect. Pyrrhosa, west of Wallace's Line. Distribution of H. irya is indicated by a dotted line, that of H. crassifolia by a line of asterisks. Crosses indicate the approximate areas of species with a number of perianth lobes deviating from that of section areas II and III.