It is a genus of shrubby plants, some ( 41 deciduous deciduous; which have the property of nitrogen fixation in the soil. Usually do not grow more than 1, 20 metres. The seeds are small and arranged in groups drupes.
. belonging to the name of the tree of Scotland; It is a genus of 35-50 species of small arboles-arbustos, belonging to the family of the miricaceas.