Prasophyllum asinantum R.J.Bates

Plants slender, 100–180 mm tall. Free part of leaf to 100 × 1–2 mm. Spike 60–110 mm long, 1–7-flowered. Ovary shortly stalked, green. Flowers well spaced, scented, 10–12 × 7–8 mm, green to greenish brown, petals pale with darker median band, labellum cream to white, callus yellowish green. Dorsal sepal 5–6 × 2.5–3 mm, incurved. Lateral sepals free or fused at base, 5–6 × 1.2 mm, obliquely erect, shallowly recurved, divergent. Petals 3–3.5 × 1 mm, incurved to spreading. Labellum sessile, ovate-lanceolate, 6.5–7 × 2–3 mm, surface smooth, porrect at base, sharply reflexed near middle, basal margins smooth, distal margins weakly wavy/crinkled. Callus narrow, raised, tapered, shiny, extending nearly to labellum apex.

Grows on and around low limestone rises in mallee heath and mallee shrubland in freely draining sand.