Diuris praecox

Diuris praecox is a tuberous, perennial herb with two or three linear leaves 150–400 mm (6–20 in) long, 3–5 mm (0.1–0.2 in) wide and folded lengthwise. Between six and ten flowers 20–25 mm (0.8–1 in) wide are borne on a flowering stem 200–400 mm (8–20 in) tall. The flowers are pale yellow with a few dark brown markings at the base of the dorsal sepal and labellum. The dorsal sepal is more or less erect, narrow egg-shaped, 9–11 mm (0.35–0.43 in) long and 4.5–6 mm (0.18–0.24 in) wide. The lateral sepals are linear to lance-shaped, 12–15 mm (0.5–0.6 in) long, about 2 mm (0.08 in) wide, turned downwards and parallel to each other. The petals are more or less erect with a narrow elliptic to egg-shaped blade 8–12 mm (0.3–0.5 in) long and 5–6 mm (0.20–0.24 in) wide on a blackish stalk 4–6 mm (0.16–0.24 in) long. The labellum is 9–12 mm (0.4–0.5 in) long and has three lobes. The centre lobe is egg-shaped, 7–9 mm (0.3–0.4 in) long, 5–7 mm (0.2–0.3 in) wide and the side lobes are linear to egg-shaped, 3–4 mm (0.1–0.2 in) long and about 1.5 mm (0.06 in) wide. There are two ridged calli 3–5 mm (0.1–0.2 in) long in the mid-line of the labellum. Flowering occurs from July to early September.

The early doubletail grows in coastal and near-coastal forests between Bateau Bay and Smiths Lake, especially in the Munmorah State Conservation Area and Wyrrabalong National Park.