Arrowheads
At least two different species of arrowhead occur in Maryland, the coastal arrowhead (Sagittaria graminea) and the common arrowhead (S. latifolia). Both are perennial herbs, both emerge from the water and can reach 5 feet, and both have above-water leaves. Coastal arrowhead often has underwater leaves, especially the young plant which is narrow and stalkless and found in clumps. The leaves of common arrowhead are usually shaped like arrow heads.