Pterostylis pyramidalis (Leafy Snail Greenhood)

Pterostylis pyramidalis, commonly known as the tall snail orchid or leafy snail orchid, is a species of orchid which is endemic to the south-west of Western Australia. As suggested by one of its common names, it can be distinguished from other snail orchids by its height of up to 35 cm (10 in).

The tall snail orchid grows on grey-black peaty sand on the margins of swamps. It sometimes forms large colonies often with the flowers partly submerged. It occurs in the Avon Wheatbelt, Esperance Plains, Jarrah Forest, Mallee, Swan Coastal Plain and Warren biogeographic regions of Western Australia.