A common name is a name that is used to identify a plant or a tree by its general characteristics, such as shape, color, smell, or use. Common names are not standardized and may vary from region to region, or even from person to person. For example, the common name "basswood" can refer to different species of the genus Tilia, depending on where you are. Common names are often easier to remember and pronounce than scientific names, which are based on a system of binomial nomenclature that assigns a unique two-part name to each plant or tree. Scientific names are more precise and consistent, but they may change over time due to new discoveries or classifications. For example, the scientific name of the American elm is Ulmus americana, which distinguishes it from other species of elms.