Dilleniidae is a taxonomic group of flowering plants that includes over 4,000 species. Some synonyms for Dilleniidae are the Theanae, Calyceraceae, and Flacourtiaceae. These names were used to classify plants before they were grouped into the modern-day Dilleniidae family. Dilleniidae is part of the larger group called the Rosids, which includes familiar families such as Leguminosae (the peas and beans) and Rosaceae (the roses). Taxonomy is important for understanding the relationships between species and their evolutionary history. By identifying synonyms, scientists can track changes in plant classification over time and improve our understanding of plant biodiversity.