ORCHIDALES

orchid order of monocotyledonous flowering plants, a division of the subclass Liliidae. Additional reading Helmut Bechtel, Phillip Cribb, and Edmund Launert, The Manual of Cultivated Orchid Species, 3rd ed. (1992; originally published in German, 1980), a well-illustrated encyclopaedic treatment of cultivated orchids; Robert L. Dressler, The Orchids: Natural History and Classification (1981, reissued 1990); Floyd S. Shuttleworth, Herbert S. Zim, and Gordon W. Dillon, Orchids, rev. ed. (1989), containing illustrated general information and a survey of the principal orchid genera and species; L. van der Pijl and Calaway H. Dodson, Orchid Flowers: Their Pollination and Evolution (1966), a detailed treatment; the series Orchid Biology: Reviews and Perspectives, ed. by Joseph Arditti (1977 ).