Data Views Total Plants: 2 CSV Excel PDF Click on column headings to sort table by that column Plant Part All Seed Essent. Oil Shoot Low PPM High PPM StdDev *Reference Apium graveolens Shoot -- 0.7 * Apium graveolens Seed Essent. Oil 727.0 10000.0 * *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.