Common Twayblade – Listera ovata
grows in a variety of habitats: woods, meadows, dune-slacks and moorland. The flowering stems are typically 20–60 cm (7.9–23.6 in) tall, occasionally up to 75 cm (30 in). There are two large opposite basal leaves (hence the common name), 5–20 cm (2.0–7.9 in) long. A variable number of flowers is borne on the stems, usually more than 15 but less than 100. The flowers are small and yellowish-green in colour. The sepals and the two side petals form a fairly open hood, 5–6 mm (0.2 in) long; the labellum or lip (the central petal) is 7–15 mm (0.3–0.6 in) long and is divided at the end into two lobes.