In the January issue of Scientific American we offer an unusual tour of the Amazon's biodiversity—by way of its seeds. A photo feature by editor Anna Kuchment presents 24 seeds from the Amazon recently catalogued by botanists Fernando Cornejo and John Janovec of the Botanical Research Institute of Texas.

There's more where that came from. Cornejo and Janovec catalogued some 750 seeds for their new field guide, Seeds of Amazonian Plants (Princeton University Press, 2010).

Here are five more photos, in close-up detail, along with commentary from Janovec in some of the captions.