A harvesting header has an outer impeller fixed to an outermost outboard cutter for rotation therewith to convey cut crop material laterally inwardly toward the center of the header. The outer impeller has a lower disc member forming the bottom of an impeller cage and an upper stationary grass ring. An intermediate impeller is located between the axes of rotation of the two outboard cutters, wherein the intermediate cage-like impeller is suspended on the harvesting header above the cutting plane and not fixed to any of the cutters and rotates in the same direction as the outboard impeller. The outboard and intermediate impellers have a plurality of crop conveying discs, wherein the crop conveying discs on the outboard impeller are offset vertically and overlap horizontally with the crop conveying discs on the intermediate impeller to form an intermeshing region between the two impellers.
