Pterostylis aneba is a species of orchid endemic to south-eastern Australia. It is a recently described and poorly-known greenhood similar to Pterostylis alpina and P. monticola. It has a rosette of fleshy leaves at the base of the plant and a single green and white flower. It grows in alpine and sub-alpine habitats.
Pterostylis aneba is a terrestrial, perennial, deciduous, herb with an underground tuber and a rosette of three to five egg-shaped leaves surrounding the base of the flowering stem. Each leaf is NaNsigfig=1NaNsigfig=1 long and NaNsigfig=1NaNsigfig=1 wide. A single green and white flower about NaNsigfig=1NaNsigfig=1 long is borne on a spike up to 200sigfig=1NaNsigfig=1 high. The dorsal sepal and petals are fused, forming a hood or "galea" over the column. The dorsal sepal is the same length as the petals and curves forward with a pointed tip. There is a gap between the galea and the lateral sepals. The lateral sepals are erect and have thread-like tips 15–20 mm long and a slightly bulging V-shaped sinus between them. The labellum is NaNsigfig=1NaNsigfig=1 long, about 3sigfig=1NaNsigfig=1 wide, green or brown and curved and protrudes above the sinus. Flowering occurs from December to February.[1]
Pterostylis aneba was first formally described in 2006 by David Jones and the description was published in Australian Orchid Research from a specimen collected at Packers Swamp, west of Bemboka.[2]
This greenhood grows in moist grassy areas in montane forest and near streams in southern New South Wales and north-eastern Victoria.[3]