Pterostylis sinuata (D.L.Jones) Janes & Duretto

Rosette leaves 6–10, obovate or elliptic, 8–32 × 6–12 mm, bright green to light green, fleshy, margins strongly wavy. Flower stem 70–160 mm tall, 3–4 mm across, 2–20-flowered. Sterile bracts 4–6. Flowers densely crowded, green with darker green stripes, 8.5–10 × 4 mm, shiny. Lateral sepals shallowly pouched, 4.5–5 × 7–8 mm when flattened. Petals 6–7 × 3–4 mm, light green with darker veins, margins irregular. Labellum oblong to obovate, 2–2.5 × 2 mm, whitish green with a dark green appendage 1–1.2 × 1 mm, with thickened, dark green margins and a beak 1.5–2 mm long.

Localised; found growing among sparse shrubs and sedges in swamps and seepage areas in moist to seasonally wet, brown clay loam over laterite.