HABIT Perennial. Rhizomes short; pachymorph. Culms erect; 500-800 cm long; woody. Culm-internodes terete. Lateral branches dendroid. Branch complement several; in a horizontal line; with 3 branches dominant; thinner than stem. Culm-sheaths persistent; without auricles. Culm-sheath blade triangular. Ligule an eciliate membrane. INFLORESCENCE Inflorescence comprising only a few spikelets; embraced at base by subtending leaf. Spikelets solitary. Fertile spikelets pedicelled. FERTILE SPIKELETS Spikelets comprising 8-12 fertile florets; with diminished florets at the apex. Spikelets lanceolate, or oblong; laterally compressed; 20-30 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes pubescent. GLUMES Glumes both absent or obscure. FLORETS Fertile lemma ovate; chartaceous; keeled; 9-11 -veined. Lemma surface puberulous; hairy on veins. Lemma apex acuminate. Palea 0.8 length of lemma. Palea keels ciliolate. Apical sterile florets resembling fertile though underdeveloped. FLOWER Lodicules 3; membranous. Anthers 3-5. Stigmas 2. Ovary umbonate. FRUIT Caryopsis with adherent pericarp. DISTRIBUTION South America.