Pterostylis anatona, commonly known as the Eungella greenhood, is a species of orchid endemic to Queensland. It has a rosette of wrinkled leaves at the base of the plant and a single light green and white flower, reddish towards its tip. It grows in higher areas between Eungella and the Blackdown Tableland National Park.
Pterostylis anatona is a terrestrial, perennial, deciduous, herb with an underground tuber and a rosette of dark green, wrinkled leaves NaNsigfig=1NaNsigfig=1 long and NaNsigfig=1NaNsigfig=1 wide. A single light green and white flower NaNsigfig=1NaNsigfig=1 long and NaNsigfig=1NaNsigfig=1 wide with a reddish-brown tip is borne on a spike NaNsigfig=1NaNsigfig=1 high. The dorsal sepal and petals are fused, forming a hood or "galea" over the column. The dorsal sepal is slightly shorter than the petals. There is a wide gap between the galea and the lateral sepals. The lateral sepals are erect and have narrow tips NaNsigfig=1NaNsigfig=1 long and a bulging V-shaped sinus between them. The labellum is NaNsigfig=1NaNsigfig=1 long, about 4sigfig=1NaNsigfig=1 wide, reddish-brown and curved and protrudes above the sinus. Flowering occurs from June to August.[1]
Pterostylis anatona was first formally described in 1997 by David Jones and the description was published in The Orchadian from a specimen collected near Eungella.[2] The specific epithet (anatona) is a Latin word meaning "stretching or extending upward".[3]
The Eungella greenhood grows in forest with a grassy understorey above 800sigfig=1NaNsigfig=1 between Eungella and the Blackdown Tableland.