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Many legumes have root nodules that provide a home for symbiotic nitrogen-fixing bacteria called rhizobia. This relationship is particularly common in nitrogen-limited conditions. The Rhizobia convert nitrogen gas from the atmosphere into ammonia, which is then used in the formation of amino acids and nucleotides .
Most legumes that can make nodules do so only on their roots, but there are a few groups of plants that also nodulate on their stems. They usually grow in wetlands or seasonally-flooded regions of the tropics. Nodulation of their stems in a flooded environment allows these legumes to fix nitrogen in wet conditions.