Unifolium bifolium var. ovale ssp. hirtellum Farwell                                      Isolectotype

Uniola longifolia Scribn.                                                                                 Isosyntype

Uniola longifolia Scribn.                                                                                 Isosyntype

Urostephanus gonoloboides Robinson & Greenman                                        Isotype

Urtica strigossima Rydbert                                                                             Isotype

Urvillea biternata Weatherby                                                                         Isotype

Utricularia floridana Nash                                                                             Isotype

Utricularia lobata Fernald                                                                              Isotype