Pterostylis flavovirens

Pterostylis flavovirens, is a terrestrial, perennial, deciduous, herb with an underground tuber. Non-flowering plants have a rosette of between three and five egg-shaped leaves, each leaf 5–27 mm (0.2–1 in) long and 3–9 mm (0.1–0.4 in) wide on a stalk 20–50 mm (0.8–2 in) tall. Flowering plants have up to seven transparent pale to translucent green flowers with darker green stripes on a flowering spike 30–200 mm (1–8 in) high. The flowering spike has between three and six egg-shaped stem leaves which are 5–40 mm (0.2–2 in) long and 2–9 mm (0.08–0.4 in) wide. The dorsal sepal and petals are fused, forming a hood or "galea" over the column with the dorsal sepal 12–15 mm (0.5–0.6 in) long and shallowly curved with a brownish tip. The petals are 9–12 mm (0.4–0.5 in) long, about 2 mm (0.08 in) wide with narrow flanges on their outer edges. The lateral sepals are 9–13.5 mm (0.4–0.5 in) and joined for all but about 3 mm (0.1 in), forming a structure 4–6 mm (0.16–0.24 in) wide. The labellum is insect-like, 4.5–6 mm (0.18–0.24 in) long, about 2 mm (0.08 in) wide, with a darker green stripe along its centre and a mound on the "head" end. Flowering occurs from July to September.[3]

This orchid was first formally described in 2006 by David Jones who gave it the name Bunochilus flavovirens. The description was published in the journal Australian Orchid Research from a specimen collected near Port Lincoln.[4] In 2008 Robert Bates changed the name to Pterostylis flavovirens.[5] The specific epithet (flavovirens) is derived from the Latin words flavus meaning “golden-yellow” or "yellow"[6]^:872 and virens meaning "green",[6]^:383[3] referring to the colour of the labellum.[3]

Pterostylis flavovirens is found in coastal areas of the Eyre Peninsula, Yorke Peninsula, Southern Lofty, Kangaroo Island and South-Eastern botanical regions of South Australia.[7] It often grows in accumulated leaf litter under small trees and shrubs.[3]