HABIT Annual. Culms 0.4-1 cm long. Leaves without demarcation between sheath and blade. Ligule an eciliate membrane. Leaf-blades triangular. INFLORESCENCE Inflorescence a panicle; subtended by an inflated leaf-sheath; embraced at base by subtending leaf. Panicle capitate. Spikelets solitary. Fertile spikelets pedicelled. FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 3-3.5 mm long; breaking up at maturity; disarticulating below each fertile floret. GLUMES Glumes persistent; shorter than spikelet, or reaching apex of florets; thinner than fertile lemma; parallel to lemmas, or recurved at apex. Lower glume oblong; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex cuspidate. Upper glume oblong; 0.9-1 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume apex cuspidate. FLORETS Fertile lemma oblong; membranous; keeled; 1-5 -veined. Lemma surface pubescent. Lemma apex cuspidate; muticous, or mucronate. Palea 1 length of lemma; 1-2 -veined; without keels. Palea surface pubescent. FLOWER Lodicules 2; membranous; 2-toothed. Anthers 3. Stigmas 2. Ovary glabrous. FRUIT Caryopsis with adherent pericarp; oblong; laterally compressed. Embryo 0.4 length of caryopsis. Hilum punctiform. DISTRIBUTION South America.