Juncus megacephalus

Juncus megacephalus is a perennial herb spreading by means of underground rhizomes. Erect stems are round in cross-section, 3–4 mm in diameter, up to 110 cm tall. Leaves are up to 24 cm long. Inflorescence is a panicle of up to 20 heads. Each head is spherical, about 10 mm in diameter, with about 50 flowers. Flowers are straw-colored, about 20 mm in diameter.