Monocotyledonae
Monocotyledonae , proper noun
A class of plants comprising seed plants that produce an embryo with a single cotyledon and parallel-veined leaves: grasses; lilies; palms; and orchids. It is divided into four subclasses or superorders: Alismatidae; Arecidae; Commelinidae; and Liliidae.
Also: Monocotyledones