HABIT Perennial. Rhizomes short. Culms erect; 30-60 cm long. Ligule an eciliate membrane. Leaf-blade base with a false petiole. Leaf-blades lanceolate. Leaf-blade venation with distinct cross veins. INFLORESCENCE Inflorescence composed of racemes. Racemes single; paucilateral; bearing few fertile spikelets; bearing 6-7 fertile spikelets on each. Rhachis subterete. Spikelet packing broadside to rhachis; lax. Spikelets solitary. Fertile spikelets pedicelled. Pedicels oblong. FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with diminished florets at the apex. Spikelets lanceolate, or cuneate; laterally compressed; gibbous; 6.64-9.6 mm long; falling entire. GLUMES Glumes shorter than spikelet. Lower glume elliptic; 1.4 length of upper glume; herbaceous; without keels; 15-16 -veined. Lower glume lateral veins ribbed. Lower glume surface pilose. Lower glume apex obtuse. Upper glume ovate; 1 length of adjacent fertile lemma; herbaceous; without keels; 10-11 -veined. Upper glume lateral veins ribbed; with cross-veins. Upper glume surface pilose. Upper glume apex obtuse. FLORETS Fertile florets female. Fertile lemma oblate; gibbous; herbaceous; without keel; 15-19 -veined. Lemma lateral veins ribbed. Lemma surface pilose; hairy between veins. Lemma margins connate below. Lemma apex obtuse. Palea 2 -veined. Palea keels winged. Apical sterile florets 2-4 in number; male; lanceolate. FLOWER Lodicules 2; fleshy. Anthers 3. FRUIT Caryopsis with adherent pericarp; oblong; laterally compressed. Hilum punctiform. DISTRIBUTION South America.