Data Views Total Plants: 61 CSV Excel PDF Total Activities: 3 , Previous1234 Show all rows. Paginate rows. Click on column headings to sort table by that column Plant Part All Essential Oil Flower Essent. Oil Fruit Fruit Essent. Oil Gum Leaf Leaf Essent. Oil Plant Rhizome Rhizome Essent. Oil Root Root Essent. Oil Seed Seed Essent. Oil Shoot Low PPM High PPM StdDev *Reference Zingiber 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.