Keywords: Lactuca serriola NRCS-1.jpg en Lactuca serriola L - prickly lettuce 1991 http //plants usda gov/java/largeImage imageID lase_001_avp tif Robert H Mohlenbrock USDA-NRCS PLANTS Database / USDA SCS 1991 Southern wetland flora Field office guide to plant species South National Technical Center Fort Worth Robert H Mohlenbrock USDA SCS 1991 Southern wetland flora Field office guide to plant species South National Technical Center Fort Worth Courtesy of USDA NRCS Wetland Science Institute PD-USGov Uploaded with UploadWizard Lactuca serriola Photographs by Robert H Mohlenbrock |