Diuris arenaria (Tomaree donkey orchid) is a tuberous herb with up to nine mauve flowers, and the sepal is more or less erect.
Diuris arenaria, commonly known as the Tomaree donkey orchid or sand doubletail is a species of orchid which is endemic to a very small area of New South Wales. Diuris arenaria is a tuberous, perennial herb with two linear to lance-shaped leaves 150500 mm (620 in) long, 26 mm (0.080.2 in) wide and folded lengthwise. Up to nine mauve or light purple and white flowers 2030 mm (0.81 in) wide are borne on a flowering stem 150500 mm (620 in) tall. The sepal is more or less erect, egg-shaped, 1018 mm (0.40.7 in) long and 711 mm (0.30.4 in) wide. 
