HABIT Perennial. Culms 50-140 cm long. Ligule an eciliate membrane. INFLORESCENCE Inflorescence composed of racemes. Racemes borne along a central axis; unilateral. Rhachis angular; terminating in a barren extension; extension bristle-like. Spikelet packing abaxial; 2 -rowed. Spikelets subtended by an involucre. Fertile spikelets sessile; 1 in the cluster. Involucre composed of bristles. Involucral bristles persistent; flexible. FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; 3.5-4.7 mm long; falling entire. GLUMES Glumes reaching apex of florets; thinner than fertile lemma. Lower glume ovate; herbaceous; without keels; 3 -veined. Lower glume apex acute. Upper glume ovate; 1.75 length of adjacent fertile lemma; herbaceous; without keels; 9-11 -veined. Upper glume apex acute. FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret ovate; cartilaginous; 5 -veined; acute. Palea of lower sterile floret becoming indurate on flanks at maturity; winged on keels. Fertile lemma elliptic; indurate; without keel. Lemma surface papillose. Lemma margins involute. Lemma apex apiculate. Palea indurate. DISTRIBUTION Pacific, or North America, or South America.