Abstract: A rotary mower mechanism of the type having a plurality of rotatable cutter units on a transversely extending cutter bar supported on skid means. Each cutter unit is provided with at least one blade operatively extending between the skid and a guard mounted over the cutter bar to provide protection and aid in the conveyance of cut crop material in a rearward direction. A rotatable crop conveyor assembly is provided to sweep crop material across the area of the cutter bar and facilitate its conveyance in a rearward direction for eventual discharge. The mower mechanism also includes rearwardly disposed crop conditioner means adapted to operate on the crop prior to discharge thereof to the ground.