{{Speciesbox | name = Keeled greenhood | image = LR063 72dpi Pterostylis depauperata.jpg | image_caption = Drawing of Pterostylis depauperata by Lewis Roberts | genus = Pterostylis | species = depauperata | authority = F.M.Bailey | synonyms_ref = | synonyms = Crangonorchis depauperata (F.M.Bailey) D.L.Jones & M.A.Clem. Diplodium depauperatum (F.M.Bailey) M.A.Clem. & D.L.Jones }}Pterostylis depauperata, commonly known as the keeled greenhood, is a species of orchid endemic to Queensland. Flowering plants have a rosette of leaves at the base of a flowering stem with a single small white flower with pale green marks, and a few small stem leaves. Non-flowering plants only have a rosette of leaves. All three sepals on the flower have relatively long, thread-like tips. DescriptionPterostylis depauperata is a terrestrial, perennial, deciduous, herb with an underground tuber and which often grows in colonies. Non-flowering plants have a rosette of between three and seven egg-shaped, greyish green leaves lying flat on the ground. Each leaf is long and wide. Flowering plants have a single flower long and wide on a flowering stem high with a few small stem leaves. The flowers are white with pale green striations. The dorsal sepal and petals are fused, forming a hood or "galea" over the column. The dorsal sepal has a thread-like tip long and lateral sepals are erect, held closely against the galea and have thread-like tips long. The labellum is long, about wide, dark brown and curved, and just protrudes above the sinus. Flowering occurs from March to August. Taxonomy and namingPterostylis depauperata was first formally described in 1943 by Frederick Bailey from a specimen collected near Cairns. The description was published in the Botany Bulletin'' of the Queensland Department of Agriculture. Distribution and habitat The keeled greenhood grows with grasses and small shrubs in woodland and forest between Cooktown and Ravenshoe at altitudes above . References depauperata Endemic orchids of Australia Orchids of New South Wales Plants described in 1891