It is a genus of aquatic, grass-like species stout perennial with triangular stems grow up to 2 meters high. Leaves are few, basal, often half as long as the stem, 1 to 2 centimeters wide. Inflorescence terminal, large, corymbiform, Spikelets are very numerous, brown, ovoid, and 5 to 8 millimeters long.
Nuts are obovoid, trigonous, dark brown or black, and shining.
*above specification are indicative only. actual dimensions may vary by +-10%