This greenhood has a green and white, striped flower with deep red-brown markings especially on its "galea", and a sharply pointed dorsal sepal.

Pterostylis grandiflora is a terrestrial, perennial, deciduous, herb with an underground tuber and when not flowering, a rosette of four to nine egg-shaped leaves.

The lateral sepals are erect and held closely against the galea and there is a broad, flat, platform-like protruding sinus between their bases.

[2][3][4][5]Pterostylis grandiflora was first formally described in 1810 by Robert Brown and the description was published in the Prodromus Florae Novae Hollandiae et Insulae Van Diemen.

[8] The cobra greenhood grows in moist shady places in forest on the coast and tablelands of southern Queensland, New South Wales, Victoria and Tasmania.