tall greenhood

Pterostylis melagramma, is a terrestrial, perennial, deciduous, herb with an underground tuber. Non-flowering plants have a rosette of between three and six narrow egg-shaped leaves, each leaf 13–50 mm (0.5–2 in) long and 4–11 mm (0.2–0.4 in) wide on a stalk 30–100 mm (1–4 in) high. Flowering plants have up to twenty translucent flowers with faint darker lines on a flowering spike 150–800 mm (6–30 in) high. The flowering spike has between five and seven stem leaves which are 25–80 mm (1–3 in) long and 5–10 mm (0.2–0.4 in) wide. The flowers are 13–15 mm (0.5–0.6 in) long, 4–8 mm (0.2–0.3 in) wide. The dorsal sepal and petals are joined to form a hood over the column with the dorsal sepal suddenly curving downwards near its tip which is often brown. The lateral sepals turn downwards and are 11–13 mm (0.4–0.5 in) long, 6–7 mm (0.2–0.3 in) wide and joined to each other for about half their length. The labellum is about 5 mm (0.2 in) long, 2 mm (0.08 in) wide, brownish-yellow and hairy with a dark stripe along its mid-line. Flowering occurs from June to November.

Black-stripe leafy greenhood is widely distributed and common in higher rainfall areas of Victoria and Tasmania and also occurs in south-eastern South Australia and southern New South Wales.