This section is from the book "Wayside And Woodland Blossoms", by Edward Step. Also available from Amazon: Wayside And Woodland Blossoms: A Guide To British Wild-Flowers.
This species is very similar in structure and habit to the Marsh Orchis, but the tubers are more cylindrical in shape, the radical leaves almost always restricted to two, the flower-spike lax. Flowers white with a greenish tinge, the labellum and spur very long: fragrant. The stigma two-lobed. Fertilized by moths. Occurs in meadows, hill-sides and woods, flowering from June to August.