This species of fuirena grows in isolated clumps, and does not form colonies. Lake-rush is found in bogs, wet shores, and roadside ditches. Lake-rush stems grow to a foot-and-a-half tall. Its leaf blades are grass-like and spreading. They are narrow (only about a quarter of an inch wide); and up to 6 inches long. The leaf sheaths are hairy. The inflorescence of lake-rush usually has a cluster of large, oblong spikelets. The spikelets are up to three-quarters of an inch long. They are burr-like, being covered with small scales; each of which is tipped with a long, greenish, de-curved spine. Lake-rush grows in small clumps. Its leaves are grass-like and up to 6 inches long. It has hairy leaf sheaths. At the top of the stem is a cluster of 2 or more large, oblong spikelets. The spikelets are covered with greenish, de-curved spines.