Rhubarb Butter Crunch

2 cups rhubarb, finely cut

1 cup granulated sugar

3 tablespoons flour

1 cup brown sugar

1 cup oatmeal

1 ½ cups flour

½ cup butter

½ cup shortening

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Combine rhubarb, granulated sugar and 2 tablespoons flour; put into 8x8 inch greased pan. Combine brown sugar, oatmeal and 1 ½ cups flour; cut in butter and shortening as for pie crust. Spread over rhubarb mixture and bake in 350 degree oven for 30 to 40 minutes.