Data Views Total Plants: 21 CSV Excel PDF Show All Paginate , Previous12 Click on column headings to sort the list on the column Plant Part All parts ... Fruit Leaf Seed Shoot Stem Low PPM High PPM StdDev *Reference Vigna unguiculata Seed 0.21 2.4 * *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.