Diuris maculata

Diuris maculata is a tuberous, perennial herb with two or three linear leaves 150–250 mm (6–10 in) long, 3–4 mm (0.1–0.2 in) wide and folded lengthwise. Between two and eight flowers 20–25 mm (0.8–1 in) wide are borne on a flowering stem 150–350 mm (6–10 in) tall. The flowers are yellow with dark brown to blackish spots on all flower parts, sometimes on the reverse side. The dorsal sepal is erect or curved forwards, 7–10 mm (0.3–0.4 in) long and 5–7 mm (0.2–0.3 in) wide. The lateral sepals are linear to lance-shaped, 10–15 mm (0.4–0.6 in) long, about 2 mm (0.08 in) wide, turned downwards and crossed. The petals are erect to curved backwards, with an egg-shaped blade 7–11 mm (0.3–0.4 in) long and 6–9 mm (0.2–0.4 in) wide on a blackish stalk 4–7 mm (0.2–0.3 in) long. The labellum is 4–6 mm (0.16–0.24 in) long and has three lobes. The centre lobe is wedge-shaped, 3–5 mm (0.1–0.2 in) long and 5–7 mm (0.2–0.3 in) wide and the side lobes are 4–7 mm (0.2–0.3 in) long and 2–3 mm (0.08–0.1 in) wide. There are two ridged calli about 4–7 mm (0.2–0.3 in) long in the mid-line of the labellum. The species is similar to D. pardina but has lighter coloured flowers with smaller brown markings. Flowering occurs from July to November.[2][3]

Diuris maculata was first formally described in 1805 by James Edward Smith and the description was published in Volume 1 of his book, Exotic Botany.[4] The specific epithet (maculata) is a Latin word meaning "spot", "stain" or "speckle".[5]

The spotted doubletail grows in shrubby forest and heath between Taree and Eden, mainly in coastal and near-coastal areas.[2][3]

This orchid has been shown to mimic the flowers of several native peas, including Hardenbergia violacea and Daviesia ulicifolia. The native bee Trichocolletes venustus visits both orchid and peas flowers and obtains food from the pea but not from the orchid, which even has a UV nectar guide similar to that on the peas.[6]