Purple Pansy Orchid

Diuris longifolia is a tuberous, perennial herb with up to three narrowly linear leaves 100–200 mm (3.9–7.9 in) long and 8–10 mm (0.31–0.39 in) wide. Up to seven purple and mauve flowers with yellowish markings, 20–30 mm (0.79–1.18 in) wide are borne on a flowering stem 100–350 mm (3.9–13.8 in) tall. The dorsal sepal is erect, 10–12 mm (0.39–0.47 in) long and wide, the lateral sepals turned abruptly downwards, 16–22 mm (0.63–0.87 in) long and 3–4 mm (0.12–0.16 in) wide. The petals are erect, the blades 11–16 mm (0.43–0.63 in) long and 7–9 mm (0.28–0.35 in) wide on a stalk 4–6 mm (0.16–0.24 in) long. The labellum is 6–9 mm (0.24–0.35 in) long with three lobes - the centre lobe narrowly wedge-shaped, 6–8 mm (0.24–0.31 in) long and 4–5.5 mm (0.16–0.22 in) wide with a down-turned tip, the side lobes spread 6–8 mm (0.24–0.31 in) long and 3–4.5 mm (0.12–0.18 in) wide. There is a single yellow callus 2–4 mm (0.079–0.157 in) along the mid-line of the labellum. Flowering occurs from September to November.

Purple pansy orchid is found between Perth and Albany, where it grows in sand, lateritic loam, clay and granite in moist situations in shrublands, woodland and forest, in the Jarrah Forest, Swan Coastal Plain and Warren bioregions of south-western Western Australia.