Sagittaria, known scientifically as Sagittaria platyphylla, is an aquatic plant famous for its arrow-shaped leaves that rise above shallow water in neat, upright clusters. Native to the southern United States, it inhabits ponds, marshes, slow rivers, and roadside wetlands. Sagittaria platyphylla spreads through both rhizomes and vegetative offsets, forming colonies that offer refuge for aquatic animals.

Its emergent leaves contrast with submerged ribbon-like foliage produced under deeper water. One of its notable traits is tolerance for a wide range of water conditions, which has allowed Sagittaria platyphylla to expand far beyond its original range. In many regions, it is now considered invasive, as dense stands can crowd out native species and affect hydrology. Its iconic arrow-leaf shape makes Sagittaria platyphylla one of the most recognizable wetland plants.