Alpine leek orchid

Prasophyllum alpinum is a terrestrial, perennial, deciduous, herb with an underground tuber and a single tube-shaped leaf, 80–200 mm (3–8 in) long and 2–5 mm (0.08–0.2 in) wide. The leaf has a white base and its free part is 80–120 mm (3–5 in) long. Between five and fourteen flowers are arranged along a flowering spike 30–100 mm (1–4 in) long. The flowers are green to greenish-brown, 5–8 mm (0.2–0.3 in) long and sometimes some of them do not open. 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 egg-shaped, 4–5 mm (0.16–0.20 in) long and about 2 mm (0.08 in) wide. The lateral sepals are joined along their sides and the petals are linear to egg-shaped, about 4 mm (0.2 in) long and 1 mm (0.04 in) wide. The labellum is egg-shaped to broad lance-shaped, 3–4 mm (0.1–0.2 in) long, about 2 mm (0.08 in) long and white or greenish. Flowering occurs from December to January.

The alpine leek orchid is common in grassland and herbfields in moist areas above 650 m (2,000 ft) south of Cradle Mountain.

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