Robust decumbent herb, probably annual, glabrous, unbranched; stems rooting at nodes, ± 0.35 m high, 4-angled and strongly 4-winged, up to 3.5 mm in diameter. Leaves glabrous, lanceolate, 30-40 x 5-11 mm, base cordate-sagittate, apex obtuse. Inflorescence an axillary cluster of 4-5 flowers, primary peduncles very short, pedicels 1-3 mm long. Bracts lanceolate, up to 2.2 x 0.3 mm but usually less. Calyx 4-lobed, glabrous, globular in fruit, up to 2.5 mm long, with sharply acute, long, erect appendages up to 1 mm long, calyx lobes almost obsolete. Petals absent. Stamens 8, included, fugaceous; filaments ± 0.7 mm long. Stigma sessile. Seeds produced in bud.
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