| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Zea mays | Silk Stigma Style | -- | -- | * | |
| Zea mays | Husk Essent. Oil | -- | -- | * | |
| Zingiber officinale | Rhizome | 1.0 | 25.0 | Duke, J. A. Writeups or information summaries on approximately 2,000 economic plants, USDA, ARS, Beltsville, MD 20705. | |
| Zingiber officinale | Rhizome Essent. Oil | -- | 500.0 | * | |
| Zea mays | Seed Essent. Oil | -- | 45000.0 | * | |
| Zea mays | Essential Oil | -- | 45000.0 | * |