Achene - Is a single-seeded fruit with seed attached at only one place to the pericarp. Ex. Sunflower, strawberry, buckwheat
Caryopsis - A fruit is similar to an achene; however, the pericarp sticks or clings to the seed. Ex. Corn, rice, barley, rye, amaranth, sorghum, oat, wheat
Samara - Is usually single-seeded with a membranous wing. Ex. Maple, elm, ash
Nut - Is a hard, one-seeded fruit. Ex. Oak, walnut, filbert, hickory
Uricle - Is like an achene, but the ovary wall fits loosely around the seed. Ex. Finger millet, pigweed
Nutlet - Is a small version of a nut. Ex. Birch, hornbeam