Plant | Low PPM | High PPM | StdDev | *Reference | |
---|---|---|---|---|---|
Valeriana officinalis | Leaf | 7.0 | 235.0 | 0.1 | Father Nature's Farmacy: The aggregate of all these three-letter citations. |
Zingiber officinale | Rhizome Essent. Oil | -- | 1800.0 | * | |
Zingiber officinale | Rhizome | 1.0 | 90.0 | Duke, J. A. Writeups or information summaries on approximately 2,000 economic plants, USDA, ARS, Beltsville, MD 20705. |