Ulmus (Elm) is a genus of tree in the family Ulmaceae. They are native to The Contiguous United States, Canada, Eastern North America, and North America. They have samaras. Individuals can grow to 21 m.
Definition: The institution that holds a type specimen for a given species. The recommended best practice is to use the identifier in a collections registry such as the Biodiversity Collections Index (http://www.biodiversitycollectionsindex.org/).