Data Views Total Plants: 2 CSV Excel PDF Total Activities: 6 Click on column headings to sort table by that column Plant Part Low PPM High PPM StdDev *Reference Digitalis purpurea Leaf 20.0 3000.0 1.0 * Digitalis lanata Leaf 50.0 200.0 -1.0 * *Unless otherwise noted all references are to Duke, James A. 1992. Handbook of phytochemical constituents of GRAS herbs and other economic plants. Boca Raton, FL. CRC Press.