Data Views Total Plants: 3 CSV Excel PDF Total Activities: 4 Click on column headings to sort table by that column Plant Part All Fruit Plant Seed Low PPM High PPM StdDev *Reference Arctium lappa Fruit 60.0 350.0 Jim Duke's personal files. Arctium lappa Seed -- 170.6 Jim Duke's personal files. Arctium lappa Plant -- -- * *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.