 <unk> species have a long history of human <unk> . <unk> <unk> <unk> seeds have been found in archaeological sites in Colombia dating back to 9000 BP . A variety of species remain important sources of edible oil , <unk> , edible seeds and fibre . The leaves of <unk> <unk> and A. <unk> are used extensively for <unk> . Several species are oil <unk> , with A. <unk> among the most important economically . <unk> extracted from A. <unk> were reported to support over 300 @,@ 000 households in the Brazilian state of <unk> in 2005 , and in 1985 it was estimated to support over 450 @,@ 000 households throughout the Brazil . <unk> fibres , extracted from the leaf bases of A. <unk> , are commercially important , and generated about US $ 20 million in annual income to Brazilian farmers in 1996 . 
