Spartina densiflora is perennial aquatic grass. It grows 1-5 ft. (0.3-1.5 m) tall and is native to South America.
Foliage
Leaf (blade) margins in-rolled, 1/8 to 1/3 inches wide at the base. Blade at a 15-35 degree angle to the stem. Internodes firm.
Flowers
The inflorescence narrow, dense, and cylindrical with branches erect and overlapping.
Fruit
Seeds are 0.25-0.4 in. (0.6-1 cm) long and smooth. S. densiflora reproduces by seed and rarely rhizomes.
Ecological Threat
S. densiflora is a nonnative grass species that invades the middle tidal zones in estuaries where it aggressively out competes native grasses, sedges and salicornia stands.