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Usually dioecious; stems very stout, 1–3 dm; lvs yellow-green, stiff, 3–6 mm wide, rough-margined, surpassing the stems; spikes numerous, sessile, densely aggregated into a head that appears almost as a single spike, the staminate heads oblong-cylindric, 3–4 × 1–2 cm, the pistillate ovoid, 3–6 × 2–4 cm; scales acuminate into a stout, often elongate cusp; perigynia ± erect, dark, lance-ovate to elliptic, thickly planoconvex, spongy-thickened below, 10–14 mm, evidently multinerved, the infolded margins lacerately toothed, the beak smooth, sharply bidentate, nearly as long as the body; achene 4–7 mm, unequally trigonous; stigmas 3. Native of e. Asia, intr. in coastal sands from Mass. to Va.
Culms bluntly angled, smooth or slightly serrulate on 1 angle distally, 10–30 cm. Inflorescences with pistillate heads 2–4 cm wide; proximal spikes appressed to ascending. Pistillate scales green or gold with distal margins white or pale gold, 0.7–1 mm wide, apex long-or short-tapered with awn to 6–12 mm. Anthers 4–6.5 mm. Perigynia appressed-ascending to ascending, with shallowly erose wing 0.4–0.6 mm wide, base acute; beak ± falcate, 3–5 mm from apex to achene, apex notched 0.4–0.6 mm adaxially. Achenes 4–7 × 1.5–2.5 mm.
A sedge. These grow in clumps and have grass like leaves and solid stalks. It grows 10-20 cm high. The culms are 3 sided. The leaves are rough and 10-20 cm long by 4-6 mm wide. They are sharp. The spikelets are in dense heads are the top of the plant.
