The coffee tree is a shrub with a straight trunk which can survive for about 70 years. The first flowers appear during the third year, but production is only profitable from the fifth year onwards. Botanists classify Coffee as a member of the Rubiaceous family. Of around sixty different species of coffee tree, two alone dominate world trade - the Coffee Arabica, or, more simply, Arabica, which represents 75% of production; and the Coffee canephora, which is commonly known by the name of the most widespread variety: Robusta. Arabica is autogamous, that is to say, capable of pollinating itself, whereas Robusta is allogamous.