Published under the auspices of the Kebun Raya Indonesia, Bogor, Java, Botanic Gardens of Indonesia, Bogor (Buitenzorg) and of the Rijksherbarium, Leyden, Netherlands. Prepared on an international co-operative basis under the supervision of several directors of botanic gardens, keepers of herbaria and various prominent botanists. General ed. C. G. G. J. Van Steenis