Pterostylis hians

Pterostylis hians, commonly known as the opera house greenhood, is a species of orchid endemic to New South Wales. Non-flowering plants have a rosette of leaves flat on the ground but flowering plants have a single shiny white and green flower. This greenhood is only known from a single location near Ulladulla.

Description
Pterostylis hians is a terrestrial, perennial, deciduous, herb with an underground tuber and when not flowering, a rosette of dark green, more or less round leaves, each leaf 8-12 mm long and 9-13 mm wide. Flowering plants have a single bright green and white flower 13-16 mm long and 10-16 mm wide on a stem 100-300 mm tall. The dorsal sepal and petals are fused, forming a hood or "galea" over the column and the dorsal sepal has a short, sharply pointed tip. The lateral sepals are held closely against the galea, have erect thread-like tips 9-12 mm long and a protruding, platform-like sinus between their bases. The labellum is about 5 mm long and 3 mm wide, just visible above the sinus. Flowering occurs from March to May.

Taxonomy and naming
Pterostylis hians was first formally described in 1997 by David Jones from a specimen collected near Manyana and the description was published in The Orchadian. The specific epithet (hians) is a Latin word meaning "gaping" or "yawning".

Distribution and habitat
The opera house greenhood grows in shrubby forest in a small area near Ulladulla.