| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Thuja occidentalis | Branches | -- | -- | * | |
| Thymus mastichina | Plant | -- | -- | Guenther, E., The Essential Oils, 6 volumes, D. van Nostrand, New York, 1948-1952. | |
| Valeriana officinalis | Root | -- | -- | * | |
| Valeriana officinalis | Root Essent. Oil | -- | -- | * | |
| Valeriana jatamansi | Root | -- | -- | Guenther, E., The Essential Oils, 6 volumes, D. van Nostrand, New York, 1948-1952. | |
| Viburnum prunifolium | Root Bark | -- | 130.0 | * |