Class Liliopsida, also known as the monocotyledons, is a diverse group of plants with various synonyms. One common synonym is the Class Monocotyledones, which refers to the fact that these plants have only one embryonic cotyledon in their seed. Another synonym is the group "Monocots," which is commonly used in scientific literature and everyday language. The term "Liliopsida" is also sometimes used interchangeably with "Liliidae," which is a subclass of monocotyledons. These plants are characterized by parallel veins in their leaves, long and narrow leaves, and flower parts usually in multiples of three. The diversity and complexity of this plant group are reflected in their various synonyms.