Theobroma cacao or five years old. A mature tree may have 6,000 flowers in a year, yet only about 20 pods. About 1,200 seeds (40 pods) are required to produce 1 kg (2.2 lb) of cocoa paste. Historically, chocolate makers have recognized three main cultivar groups of cacao beans used to make cocoa and chocolate: Forastero, Criollo and Trinitario. The most prized, rare, and expensive is the Criollo group, the cocoa bean used by the Maya. Only 10% of chocolate is made from Criollo, which is arguably less bitter and more aromatic than any other bean. In November 2000, the cacao beans
Madeira-Tapajós moist forests excelsa" and "Duckeodendron cestroides". At one time the endemic tree "Polygonanthus amazonicus" grew near Maués, the western limit for the emergent "Dinizia excelsa" and the eastern limit for the "Theobroma cacao". The Tapajós basin is the eastern limit of "Theobroma microcarpum". The "Physocalymma scaberrima" has red hardwood used by furniture makers. The montane forests of the upper Marmelos and middle Tapajós hold "Hevea camporum", "Euterpe longibracteata", "Huberodendron ingens" and "Brachynema ramiflorum". Further south in Mato Grosso there are forests in the transition between the Amazon and cerrado biomes. 183 species of mammals have been reported, including 90 bat species and