Rhubarb Butter Crunch

Recipe is from Phyllis.

3 cups rhubarb, cut in pieces
1 cup sugar
3 TB flour

1 cup brown sugar
1 cup oatmeal
1 ½ cups flour
½ cup butter or margarine
½ cup shortening

Combine first 3 ingredients, put in a buttered dish. Combine remaining ingredients, crumble over rhubarb mixture. Bake at 350 degrees for 40 minutes.