Data Views Total Plants: 4 CSV Excel PDF Total Activities: 3 Click on column headings to sort table by that column Plant Part All Essential Oil Rhizome Seed Seed Essent. Oil Low PPM High PPM StdDev *Reference Apium graveolens Seed Essent. Oil -- -- * Apium graveolens Seed 435.0 900.0 * Apium graveolens Essential Oil -- -- * Cnidium officinale Rhizome -- -- * *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.