Spiranthes spiralis, commonly known as Autumn Lady's-tresses, is the latest-blooming native species of orchid, blooming in August and September. It is characterised by a spiral inflorescence produced after the leaves have died down. The inflorescence can be very small (as little as 50mm high) especially in short grazed grassland. It occurs most frequently in close cropped grassland overlying chalk or limestone. Orchidaceae, usually referred to as the Orchid family, is a morphologically diverse and widespread family of monocots in the order Asparagales. It is currently believed to be the largest family of flowering plants with between 21,950 and 26,049 currently accepted species, found in 880 genera.