class Monocotyledonae
       n : comprising seed plants that produce an embryo with a single
           cotyledon and parallel-veined leaves: includes grasses
           and lilies and palms and orchids; divided into four
           subclasses or superorders: Alismatidae; Arecidae;
           Commelinidae; and Liliidae [syn: Monocotyledones, class
           Monocotyledones, Monocotyledonae, Liliopsida, class
           Liliopsida]