John Dransfield, Natalie W. Uhl, Conny B. Asmussen, William J. Baker, Madeline Harley, and Carl Lewis. 2008. Genera Palmarum. The Evolution and Classification of Palms. 732 pages | 500 color plates, 180 maps, 180 line drawings | 7 3/4 x 11 1/4 http://press.uchicago.edu/ucp/books/book/distributed/G/bo10041503.html