Data Views Total Plants: 401 CSV Excel PDF Total Activities: 9 , Previous1..12131415161718192021 Show all rows. Paginate rows. Click on column headings to sort table by that column Plant Part All Bark Bark Essent. Oil Branches Bulb Essential Oil Flower Flower Essent. Oil Fruit Fruit Essent. Oil Leaf Leaf Essent. Oil Pericarp Pericarp Essent. Oil Petiole Plant Resin Essent. Oil Resin, Exudate, Sap Rhizome Rhizome Essent. Oil Root Root Bark Root Essent. Oil Seed Seed Essent. Oil Shoot Shoot Essent. Oil Stem Stem Bark Stem Essent. Oil Tuber Twig Et Low PPM High PPM StdDev *Reference Zingiber officinale Rhizome Essent. Oil -- 126000.0 * *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.