Diuris eburnea D.L.Jones

Leaves 4–6, tufted, 100–160 × 1–3 mm, straight. Flower stem 200–450 mm, 1–8-flowered. Flowers porrect to semi-nodding, 15–20 mm across, cream to ivory white with purplish brown markings and callus outline. Dorsal sepal obliquely erect, 9–13 × 5–6.5 mm. Lateral sepals obliquely deflexed below labellum, 9–14 × 2–3 mm, parallel or crossed. Petals obliquely erect, widely divergent; stalk 2.5–4 mm long, purplish brown; blade ovate to elliptic, 7–11 × 6–8 mm. Labellum 9–12 mm long; lateral lobes 4.5–6 × 2.5–3.5 mm; midlobe folded with strongly downcurved margins, ovate to wedge-shaped when flattened, 8–11 × 7–10 mm, marked with red-brown. Callus ridges 2, 4–5 mm long, parallel.

Highly localised (known from only three populations); growing in shrubland on laterite ridges in areas that are wet in winter and spring.