]> GH barcode-02002031 United States of America Arizona 0.5 mile north of the Glen Canyon Dam, 0.5 mile west of U.S. Hwy. 89, north of Page. Penstemon ambiguus Torrey Torrey 2022-01-20 16:46:21 James L. Reveal, J. L. Gentry, & G. Davidse