The number in the right column stands for the sum of species that can be used for the purpose in the left column. However, by clicking on it you will notice that the amount doesn't match, so don't pay attention to the numbers here. The number isn't correct because the "minor uses" field is a mutiple value and that causes problems in counting.

Instead of looking for trees with a certain purpose it is also possible use ICM (Intercropping models) where species are filtered on more fields at the same time. By the way, this is the core of RAD: To generate a list o trees that fulfill the wdemands of the agronomist who designs different ICM's.