Data Views Total Plants: 3 CSV Excel PDF Total Activities: 4 Click on column headings to sort table by that column Plant Part All Plant Seed Seed Essent. Oil Low PPM High PPM StdDev *Reference Nigella sativa Seed -- -- * Nigella sativa Seed Essent. Oil -- -- * Nigella sativa 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.