by the Editorial Subcommittee of the Regional Technical Committee of Project NC-10, consisting of K. P. Buchholtz [and others] ; 1960 revision by F. W. Slife, K. P. Buchholtz, and Thor Kommedahl
Smithsonian ; in association with Royal Botanic Gardens, Kew ; senior editor, Helen Fewster ; US editors, Megan Douglass, Karyn Gerhard ; contributors, Jamie Ambrose, Dr. Ross Bayton, Matt Candeias, Dr. Sarah Jose, Andrew Mikolajski, Esther Ripley, David Summers