Tall leek orchid, snake orchid, piano orchid

This is a species of orchid endemic to Australia. It is one of the tallest orchids found as well as one of the most common and widespread. It often flowers in large numbers after a bushfire and has a relatively long flowering period.

The tall leek orchid is a tuberous perennial herb growing to a height of 30–120 cm, sometimes 150 cm. It has a single leaf, up to 120 cm long and a flower spike crowded, often with up to 60 flowers. The flowers are pale yellowish-green to brownish or purplish black and faintly fragrant with the sepal at the back of the flower up to 11 mm long.

The flowers appear from August to October.

Source: Wikipedia