This data package contains data from over 3000 individual fuel elements collected as part of Joint Fire Science Program (JFSP) project 11-1-4-19 "Determination of the effects of heating mechanisms and moisture content on ignition of live fuels." Data were collected each month during one of two one-year periods. Species collected from the chaparral ecosystem near Riverside, California were manzanita (2013-2014), ceanothus (2013-2014), and chamise (2012-2013). Interior western species collected in Montana included Douglas-fir (2013-2014) and lodgepole pine (2012-2013); sagebrush (2012-2013) and Gambel oak (2013-2014) were collected in Utah. Southern species collected in Florida in 2013-2014 were fetterbush, gallberry and sand pine. Species were characterized as broadleaf (manzanita, ceanothus, Gambel oak, fetterbush, gallberry) and needle (chamise, sagebrush, Douglas-fir, sand pine, lodgepole pine). Broadleaf samples consisted of whole leaves; needle samples consisted of a small length of branch with the foliage attached. Although sagebrush foliage is comprised of leaves rather than needles, the sagebrush samples were characterized as needle samples because the leaves are so small. Measurements include moisture content, relative moisture content, apparent density, length, width, needle length, stem diameter, leaf thickness, leaf surface area, fresh mass, volatiles content, fixed carbon content, ash content and lipid content.