Narrow hooded shell orchid (Pterostylis angusta)
Pterostylis angusta is a terrestrial, perennial, deciduous, herb with an underground tuber and when not flowering, a rosette of dark bluish-green leaves lying flat on the ground. Each leaf is 10–25 mm (0.4–1 in) long and 7–12 mm (0.3–0.5 in) wide. Flowering plants usually only have a single flower 12–15 mm (0.5–0.6 in) long and 7–8 mm (0.3–0.3 in) wide which leans slightly forwards on a flowering stem 80–200 mm (3–8 in) high with between three and seven stem leaves. The flowers are green and white, brownish near the tip. The dorsalsepal and petals are fused, forming a hood or "galea" over the column. The base of the galea is inflated and the top is narrow with a sharply-pointed end. The lateralsepals are held closely against the galea and have narrow tips 15–18 mm (0.6–0.7 in) long and a V shaped sinus between their bases. The labellum is 13–15 mm (0.5–0.6 in) long, about 2 mm (0.08 in) wide and curved, and protrudes above the sinus. Flowering occurs from late May to July.