Juncus megacephalus

Juncus megacephalus, the bighead rush, is a plant species native to the United States. It is known from every seacoast state from Texas to Maryland, as well as Massachusetts, growing in freshwater marshes, sand dunes, and disturbed sites at elevations less than.
Juncus megacephalus is a perennial herb spreading by means of underground rhizomes. Erect stems are round in cross-section, in diameter, up to tall. Leaves are up to long. Inflorescence is a panicle of up to 20 heads. Each head is spherical, about in diameter, with about 50 flowers. Flowers are straw-colored, about in diameter.