Abstract
The genus Monnina Ruiz et Pavon is characterized within the Polygalaceae family mainly by the nucoid fruit winged or not and the presence of one or two seeds.
It is an American genus, with ca. of 200 species distributed through the United States, Mexico and South America until Argentina, with preference for mountainous regions.
In Brazil it is represented, until this moment, by 11 species and one subspecies. We attempt to recognize them with illustrations and a key.