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 , class monocotyledonae , liliopsida , class liliopsida ]