Many of these species have been shown to fix nitrogen.

The ability to fix nitrogen is not universally present in these families.

They fix nitrogen in a form the plant can use.

Fayatrees, on the other hand, can fix nitrogen from the air.

Genus members are notable for their ability to fix nitrogen.

L. mutabilis is able to fix nitrogen from the air.

Like other species of Azolla, it can fix nitrogen from the air.

They can also fix nitrogen, like many other members of the order Rhizobiales.

Like other alders, it is able to fix nitrogen from the air.

It is thought to be able to fix nitrogen.