HABIT Perennial. Stolons present. Ligule a fringe of hairs. Leaf-blades stiff. INFLORESCENCE Monoecious, or dioecious. Inflorescence composed of racemes; embraced at base by subtending leaf. Racemes borne along a central axis; in a head; cuneate; unilateral; bearing few fertile spikelets; bearing 2-4 fertile spikelets on each. Rhachis deciduous from axis; terminating in a barren extension; extension subulate. Spikelets solitary. Fertile spikelets sessile. Male spikelets sessile. FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with diminished florets at the apex. Spikelets elliptic; dorsally compressed; 4-6 mm long; falling entire; deciduous with accessory branch structures. GLUMES Glumes collateral; shorter than spikelet; thinner than fertile lemma. Lower glume linear; 0.66 length of upper glume; membranous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume surface pilose. Lower glume apex acuminate. Upper glume lanceolate; 1 length of adjacent fertile lemma; membranous; without keels; 1 -veined. Upper glume surface pilose. Upper glume apex acuminate. FLORETS Fertile florets female. Fertile lemma elliptic; cartilaginous; without keel; 3 -veined. Lemma surface puberulous. Lemma margins ciliate. Lemma apex lobed; 3 -fid; incised 0.33 of lemma length; awned; 1 -awned. Principal lemma awn from a sinus. Apical sterile florets 2-3 in number; in a clump; rudimentary. Apical sterile lemmas awned. Apical sterile lemma awns ciliate. MALE Male inflorescence terminal; unlike female; of racemes along a central axis; with pectinate racemes. Male spikelets distinct from female; lanceolate. Male spikelet glumes 2. Male spikelet lemma muticous. DISTRIBUTION North America.