Off topic, but perhaps worth mentioning as a good example of a plant guide, especially useful for those visiting Amazonia.
Costa et al. (2011) produced an overview of all families and species of the Zingiberales group, occurring in the northwestern part of Amazonia. A well illustrated guide, with identification keys and background information on the biology and phylogenetic relationships of the genera treated. The publication is bi-lingual, both in Portuguese and English, and is available as PDF here: http://bit.ly/ljHBhR.
Reference:Costa, F.R.C., Espinelli, F.P., Figueiredo, F.O.G., 2011. Guia de zingiberales dos sitios PPBio na Amaz??nia Ocidental brasileira. ??ttema Design Editorial, Manaus: 1-284.
