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Plant Low PPM High PPM StdDev *Reference
Zingiber officinale Rhizome Essent. Oil -- 25000.0 *
Zingiber officinale Rhizome 20.0 1250.0 Duke, J. A. Writeups or information summaries on approximately 2,000 economic plants, USDA, ARS, Beltsville, MD 20705.
Zingiber officinale Root Essent. Oil -- -- *
*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.