Subclass Liliidae is a taxonomic rank that refers to a group of flowering plants commonly known as monocots. Monocots are characterized by their single cotyledon, parallel leaf veins, and tripartite flower parts. The term "Subclass Liliidae" is also used interchangeably with "Lilidae," "Monocotyledones," and "Liliopsida." Another synonym for this subclass is "Arecidae," which refers to the presence of palms in this group. This subclass includes approximately 10,000 species of plants, including popular garden plants such as lilies, orchids, and irises. Understanding the synonyms for Subclass Liliidae is essential for botanists and anyone interested in plant classification.