Preheat oven to 350 degrees. In medium bowl, combine flour, sugar and allspice. Mix we3ll. With pastry blender or two knives, cut in butter until mixture forms coarse crumbs. Set aside. Grease 2-quart shallow baking dish. Cut potatoes in 1/4-inch thick diagonal slices. Place about 1.3 of crumb mixture. Repet layers of potatoes and crumbs. Sprinkle with remaining crumb mixture and pecans. Drizzle with maple syrup. Cover with foil, and bake for 45 minutes. Remove foil. Bake until potatoes are tender, about 10 minutes.