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Annual 5–10 dm; lvs scaberulous, the larger 5–10 mm wide; ligule 5–8.5 mm; panicle 10–30 cm, erect, slender, with numerous overlapping branches 1–5 cm; spikes to 2 cm, contiguous, those of a single branch resembling a 4-rowed spike; spikelets 2.5–3.5 mm long and wide; glumes cross-wrinkled, somewhat inflated toward the elevated midvein; lemma acuminate, its point barely protruding from the glumes; a second, sterile floret sometimes present; lodicules linear, nearly 1 mm; 2n=14. Marshes and wet soil; Alas. to Calif. and N.M., e. to Ill.; O.; w. N.Y., where probably intr.; n. Asia.
A light green grass. It grows about 1 m tall. The stems are hollow. The leaf blades are 5-20 cm long by 3-10 mm wide. There are a group of spikes but they only have one flower. The flowering shoots is 10-30 cm long. The grain is 1.5 mm long. It has a tuft of hairs at the tip.
