Pterostylis robusta, commonly known as sharp-leaf greenhood, is a species of orchid endemic to south-eastern Australia. As with similar orchids, the flowering plants differ from those which are not flowering. The non-flowering plants have a rosette of leaves but the flowering plants have a single flower with leaves on the flowering spike. This greenhood has a relatively large green, white and reddish-brown flower with reddish-brown stripes with the labellum just visible inside the flower.
Pterostylis robusta is a terrestrial, perennial, deciduous, herb with an underground tuber and when not flowering, a rosette of four to ten, dark green, egg-shaped leaves. Each leaf is 10âÂÂ25 mm long and 10âÂÂ16 mm wide. Flowering plants have a single flower 27âÂÂ35 mm long and 10âÂÂ12 mm wide borne on a spike 50âÂÂ200 mm high with three to seven spreading stem leaves. The flowers are green, white and brownish with a reddish-brown tinge or stripes. The sepal and petals are fused, forming a hood or "galea" over the column. The dorsal sepal curves forward with a sharp point 2âÂÂ4 mm long. The sepals are erect, held closely against the galea, have an erect, thread-like tip 20âÂÂ30 mm long and a flat sinus with a small notch between their bases. The labellum is 12âÂÂ15 mm long, 3âÂÂ4 mm wide, dark brown or green and just visible inside the flower. Flowering occurs from April to August.
Pterostylis robusta was first formally described in 1927 by Richard Sanders Rogers and the description was published Transactions and Proceedings of the Royal Society of South Australia. The specific epithet (robusta) is a Latin word meaning "strong like oak" or "robust".
Sharp-leaf greenhood is most common in the higher rainfall areas of South Australia where it sometimes forms extensive colonies. In Victoria it grows in open forest in the north-west of the state but it is rare in New South Wales where it grows on sheltered ridges south from Wagga Wagga.