Genus Hemerocallis is a botanical term used to refer to the genus of plants commonly known as daylilies. The term "genus" refers to a group of species that share common physical characteristics. Other words that could be used to refer to this genus include Hemerocallis species, Hemerocallis plant, daylily genus or simply daylilies. Some common synonyms for the Hemerocallis genus include yellow daylily, purple daylily, Tawny daylily, fulvous daylily, and orange daylily. These synonyms allow botanists and gardening enthusiasts to refer to the genus with specific names that describe the physical features or colorations of the plant. Whether it's called Hemerocallis or its many synonyms, daylilies are a valuable addition to any garden.