Q'illu Q'illu (Aymara and Quechua q'illu yellow, the reduplication indicates that there is a group or a complex of something, "a complex of yellow", or q'illu q'illu a plant (Berberis bumaelifolia), also spelled Khellu Khellu) is a mountain in the Bolivian Andes which reaches a height of approximately 4560 meters .