Only species belonging to the Fabid clade, limited to four classes and ten families of Angiosperms, are able to form nitrogen-fixing root nodule symbioses (RNS) with soil...
PLOS ONE - 1 à 10 - 31/05/2013
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0064515
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