 <unk> has been placed in the subfamily Arecoideae , the tribe <unk> and the subtribe <unk> , together with the genera <unk> , <unk> , <unk> , Cocos , <unk> , <unk> , <unk> , <unk> , <unk> and <unk> . Within this subtribe , <unk> has been found to be a monophyletic group , and sister to the clade containing <unk> , <unk> , <unk> , <unk> and <unk> . 
