monocotyledones

(noun) 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. Synonyms: Monocotyledones, class Monocotyledones, Monocotyledonae, class Monocotyledonae, Liliopsida, class Liliopsida.