Perennial. Culms erect, or scandent; 400-1000 cm long; 15 mm diam.; woody; without nodal roots. Culm-internodes terete; solid; 5-10 cm long; smooth; distally glabrous. Lateral branches dendroid. Branch complement many; in a clump. Culm-sheath blade lanceolate; 10-15 cm long. Leaf-sheaths without keel. Leaf-sheath oral hairs ciliate. Ligule an eciliate membrane; 1-1.5 mm long; obtuse. Collar with external ligule. Leaf-blade base symmetrical; with a brief petiole-like connection to sheath; petiole 0.1-0.2 cm long; petiole pubescent. Leaf-blades deciduous at the ligule; linear, or lanceolate; 5-9 cm long; 6-17 mm wide. Leaf-blade venation with 8-10 secondary veins; with obscure cross veins. Leaf-blade surface glabrous. Leaf-blade margins scabrous.
Inflorescence a panicle; embraced at base by subtending leaf. Panicle open; oblong; secund; 2-2.5 cm long; bearing few spikelets. Primary panicle branches indistinct the panicle almost racemose. Panicle axis pubescent. Spikelets solitary. Fertile spikelets pedicelled.
Glumes persistent; similar; shorter than spikelet; thinner than fertile lemma. Lower glume orbicular; 0.5-1 mm long; 1 length of upper glume; membranous; without keels; 0 -veined. Lower glume lateral veins absent. Lower glume apex obtuse. Upper glume orbicular; 0.5-1 mm long; 0.05-0.1 length of adjacent fertile lemma; without keels; 0 -veined. Upper glume primary vein absent. Upper glume lateral veins absent. Upper glume apex obtuse.
Basal sterile florets similar; barren; without significant palea; attached to and deciduous with the fertile. Lemma of lower sterile floret ovate; 0.66 length of fertile lemma; chartaceous; ciliate on margins; truncate. Lemma of upper sterile floret ovate; 1 length of lower sterile floret; chartaceous; ciliate on margins; acute. Fertile lemma ovate; 7-9 mm long; coriaceous; yellow; without keel. Lemma apex acute.
Lodicules 3. Anthers 3. Stigmas 2.
Caryopsis with adherent pericarp; apex unappendaged.
South America: western South America, Brazil, and southern South America.