| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Vetiveria zizanioides | Root | -- | 15.0 | -0.8 | * |
| Vitex agnus-castus | Fruit Essent. Oil | -- | 6.6 | -0.8 | Jim Duke's personal files. |
| Vitex agnus-castus | Fruit | 21.0 | 4000.0 | 0.3 | * |
| Vitex agnus-castus | Flower | -- | -- | * | |
| Vitex agnus-castus | Leaf Essent. Oil | -- | 43200.0 | -0.5 | Jim Duke's personal files. |
| Vitex agnus-castus | Leaf | -- | 21.0 | -0.2 | Ekundayo, O., Laakso, I., Holopainen, M., Hiltunen, R., Oguntimein, B., and Kauppinen, V. 1990. The Chemical Composition and Antimicrobial Activity of the Leaf Oil of Vitex agnus-castus L. J. Essential Oil Research, 2: 115-119. |
| Zea mays | Husk Essent. Oil | -- | -- | * | |
| Zingiber officinale | Rhizome | -- | 720.0 | 1.1 | * |
| Zingiber officinale | Rhizome Essent. Oil | -- | 39000.0 | 1.4 | * |