plum leek orchid

Prasophyllum pruinosum is a terrestrial, perennial, deciduous, herb with an underground tuber and a single tube-shaped leaf 200–400 mm (8–20 in) long and 3–6 mm (0.1–0.2 in) wide with a reddish base. Between five and twenty flowers are arranged along a flowering spike 60–100 mm (2–4 in) long reaching to a height of 200–400 mm (8–20 in). The flowers are yellowish-green, brown, purple-plum and white and are lightly scented. As with others in the genus, the flowers are inverted so that the labellum is above the column rather than below it. The dorsal sepal is 6.5–8.5 mm (0.3–0.3 in) long and 4 mm (0.2 in) wide and the lateral sepals are 7.5–9.5 mm (0.3–0.4 in) long, 2 mm (0.08 in) wide and free from each other. The petals are 7–8 mm (0.3–0.3 in) long, 1.5 mm (0.06 in) wide, have a central dark band and turn forwards. The labellum is 7–8 mm (0.28–0.31 in) long, about 4 mm (0.2 in) wide and turns sharply upwards near its middle, the upturned part with crinkled edges. There is a brownish callus in the centre of the labellum, reaching almost to its tip. Flowering occurs from September to November.

Plum leek orchid grows in woodland and grassy forest in the Black Hill Conservation Park and near Rowland Flat, although its range was once more extensive.