The Orchidales may be divided into the following families: Burmanniaceae[?] Thismiaceae[?] Corsiaceae[?] Orchidaceae - the orchids Apostasioideae[?] - Apostasia and Neuwiedia Cypripedoideae[?] - lady's slippers (4 genera) Orchidoideae[?] - most orchids (750 genera)