Tribe IV
OPHRYDEAE. Anther one, posterior, erect, prostrate, or reflexed, with parallel or divergent, distinct cells adnate to the clinandrium, and often continuous with the rostellum; pollinia granular, produced into a caudicle in each cell. There are thirty-two genera of Ophrydeae, divided into four sub-tribes. All are terrestrial plants, with tuberous roots, the largest number of genera being found in South Africa, and but few in the tropics. The species are, perhaps, most numerous in the Mediterranean region. Examples are: Aceras, Disa, Ophrys, Orchis.