Plants 300–550 mm tall. Free part of leaf to 150 × 3–5 mm. Spike 50–120 mm long, 10–30-flowered. Ovary shortly stalked, bright green. Flowers well-spaced to moderately crowded, scented, 15–17 × 6–9 mm, greenish brown, labellum light brown, pink or white, callus greenish. Dorsal sepal 8–11.5 × 3–3.5 mm. Lateral sepals free or basally fused, 9–12 × 1–1.5 mm, usually recurved. Petals 6–9 × 1–1.2 mm, porrect to incurved. Labellum shortly stalked, 5.5–6.5 × 2–3 mm, sharply recurved near middle, base broadly elliptical, constricted near middle then narrow and tapered like a tail, distal margins slightly irregular. Callus broad, fleshy, channelled, constricted with tail-like apex, extending nearly to labellum apex.
Known only from a single locality; found growing among grass tussocks and forbs on low mounds surrounded by seasonally inundated depressions in disturbed River Red Gum woodland in heavy clay soil. The landform where this species grows is known as 'gilgai' or 'crabhole country' which develops on heavy clay that cracks when dry and swells when wet. Detritus falling into the racks adds to the volume of material which, when wet, swells and forms irregular mounds that become surrounded by sunken potholes and crabholes which fill with water. The orchids do not actually grow in water, but on mounds of saturated soil.
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