| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Daemonorops draco | Fruit | -- | -- | * | |
| Juniperus communis | Fruit | -- | -- | * | |
| Pinus strobus | Wood | -- | -- | * | |
| Pinus palustris | Resin, Exudate, Sap | -- | -- | Leung, A.Y., Encyclopedia of Common Natural Ingredients Used in Food, Drugs, and Cosmetics, John Wiley & Sons, New York, 1980. | |
| Pinus sylvestris | Plant | -- | -- | J.S. Glasby Dict.Pls Containing 2ndary Metabolite. 1991. | |
| Pinus elliottii | Resin, Exudate, Sap | -- | -- | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses | |
| Pinus sylvestris | Shoot | -- | -- | * | |
| Pinus strobus | Resin, Exudate, Sap | -- | -- | * |