Attalea has been placed in the subfamily Arecoideae , the tribe Cocoseae and the subtribe Attaleinae , together with the genera Allagoptera , Beccariophoenix , Butia , Cocos , Jubaea , Jubaeopsis , Lytocaryum , Parajubaea , Syagrus and Voanioala . Within this subtribe , Attalea has been found to be a monophyletic group , and sister to the clade containing Allagoptera , Polyandrococos , Parajubaea , Butia and Jubaea .