Dry, one-seeded fruit that develops from a single ovary and does not split open to disperse the seed. Achenes commonly occur in groups for example, the fruiting heads of buttercup Ranunculus and clematis. The outer surface may be smooth, spiny, ribbed, or tuberculate, depending on the species.
The star, which was added to the flag in 1793, initially had more than five points. The star may represent the Morning Star mentioned in the Koran. Effective date: 5 June 1936.