]> GH barcode-02074361 United States of America Virginia tributary of Blackwater River, 0.8 mile north of Unity toward Ivor. Isoetes ×brittonii D. F. Brunton & W. C. Taylor D. F. Brunton & W. C. Taylor 2020-11-09 16:21:48 D. M. Porter & H. K. Svenson