Virgate, erect or subscandent herb. Stems and branches strongly flattened (winged), terete towards the base of the plant, glabrous, 25-80 cm high; flattened portions with a prominent midrib, c. 2-8 mm broad. Rhizome short; roots rather thick. Leaves cauline, narrowly triangular, scale-like, up to 12(-25) mm long. Bracts 1-4 mm long. Pedicels usually 5-12(-15) in number, (2-)4-12 mm. Perianth segments yellow, oblong or elliptic-oblong, with a scarious margin, 6-8(-10) by up to c. 3 mm; those of the outer whorl usually with (3-)5(-7) veins; those of the inner whorl slightly narrower, with 3 veins. Filaments 2.5-3 mm, yellow; anthers c. 1-1.25 mm long. Ovary c. ½ mm long; style 3.5-4 mm. Nutlets green.
In New Guinea in savanna with Melaleuca and Acacia, in lowland savanna-woodland on sour grey soil and in grass of creek flats, subject to a strong dry season. Fl. Dec.-Jan., July-Aug.In N. Queensland found up to 950 m.
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