Acianthus cuneatus

Acianthus cuneatus is a terrestrial, perennial, deciduous, sympodial herb with a single heart-shaped, glabrous, dark green leaf that is purplish on its lower surface. The leaf is 20–65 mm (0.79–2.56 in) long, 15–48 mm (0.59–1.89 in) wide on a stalk 10–20 mm (0.39–0.79 in) tall. There are up to seven, well-spaced, translucent greenish flowers with fine purpish stripes on a thin raceme 50–200 mm (2.0–7.9 in) tall, each flower 7–9 mm (0.28–0.35 in) long. The dorsal sepal is egg-shaped, 6–7 mm (0.24–0.28 in) long, 4–5 mm (0.16–0.20 in) wide, translucent pink with purplish lines and forms a hood over the column. The lateral sepals are 5.5–6.5 mm (0.22–0.26 in) long, about 1.3 mm (0.051 in) wide, and linear to lance-shaped, the tips often curving backwards or outwards. The petals are translucent and are about 3.5–4 mm (0.1–0.2 in) long and curve inwards. The labellum is purple, 5–6 mm (0.20–0.24 in) long, 3–4 mm (0.12–0.16 in) wide and wedge-shaped, the callus dark purplish red with a central channel about 1 mm (0.039 in) wide. Flowering occurs from February to April.

This orchid grows on slopes and in sheltered areas in tall open forest on the higher parts of the Northern Tableland between Coolah Tops and Tenterfield in New South Wales.

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