It's a common problem when dealing with common names - various types of plants are sometimes referred to by the same common name (i.e. "jasmine") when there is nothing more than a superficially similar appearance that relates them. True jasmines, members of the genus Jasminum, are in the Oleaceae or olive family. Star jasmine, Trachelospermum jasminoides, is not a true jasmine and is a member of the Apocynaceae or dogbane family. These tend to be plants from subtropical or tropical origins. There is also Gelsemium, Carolina jessamine/jasmine, which is also not a true jasmine and a member of yet a different plant famiily (Gelsemiaceae/Loganiaceae).