HABIT Annual. Culms erect (1), or prostrate (1); 60-115-200 cm long; spongy (1), or firm (1); rooting from lower nodes (1/1). Lateral branches fastigiate (1/1). Ligule a fringe of hairs. Leaf-blade margins cartilaginous (1/1). INFLORESCENCE Monoecious; with male and female spikelets in the same inflorescence. Inflorescence composed of racemes. Racemes borne along a central axis; appressed; unilateral; bearing few fertile spikelets; bearing 1-4 fertile spikelets on each, or 5-10 fertile spikelets on each (1). Central inflorescence axis tip subulate. Rhachis angular; terminating in a barren extension; extension subulate. Spikelet packing abaxial. Sexes segregated; on unisexual branches; with male above. Spikelets solitary. Fertile spikelets sessile. Male spikelets sessile. FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 2-2.312-2.75 mm long; falling entire. GLUMES Glumes shorter than spikelet; thinner than fertile lemma. Lower glume ovate (1), or orbicular (1); membranous; without keels; 0 -veined (1), or 3 -veined (1). Lower glume lateral veins absent (1), or distinct (1). Lower glume apex entire, or erose, or dentate; 2 -fid; truncate (1), or obtuse. Upper glume ovate; membranous; without keels; 5-7 -veined. Upper glume apex entire, or lobed (1); 2 -fid (1/1); obtuse. FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret ovate; membranous; 5-7 -veined; acute. Fertile florets female. Fertile lemma ovate; coriaceous; much thinner on margins; without keel; 5 -veined. Lemma margins covering most of palea. Lemma apex acute. Palea 1 length of lemma; coriaceous; 2 -veined. FLOWER Anthers 3. FRUIT Caryopsis with adherent pericarp; obovoid; dorsally compressed. Embryo 0.66 length of caryopsis. Hilum punctiform. MALE Male spikelets distinct from female; oblong. Male spikelet glumes 2. DISTRIBUTION Australasia.