]> GH barcode-00946004 United States of America Maryland 1/4 mile below Conowingo dam; 1 1/4 miles west of Rowlandsville. Boechera laevigata (Muhlenberg ex Willdenow) Al-Shehbaz (Muhlenberg ex Willdenow) Al-Shehbaz 2020-11-23 14:08:58 R. R. Tatnall