| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Pistacia vera | Seed | -- | 11.0 | -0.6 | * |
| Pisum sativum | Seed | 2.0 | 23.0 | -0.1 | * |
| Prunus serotina | Leaf | 2.0 | 48.0 | -0.4 | * |
| Prunus domestica | Fruit | 1.0 | 255.0 | 4.3 | * |
| Prunus persica | Fruit | 1.0 | 150.0 | 2.2 | * |
| Prunus cerasus | Fruit | 1.0 | 80.0 | 0.8 | * |
| Prunus serotina | Stem | -- | 54.0 | 1.6 | * |
| Prunus dulcis | Seed | 8.0 | 38.0 | 0.7 | * |
| Prunus armeniaca | Fruit | 1.0 | 70.0 | 0.6 | Betting on Boron, Unpublished draft by J. A. Duke on file at USDA, draft and papers relating to boron percentages. Includes Internat. Z. Vit. Ern. Forschung 43:1973 (boron). |
| Pyrus communis | Fruit | 1.0 | 82.0 | 0.8 | * |
| Quercus stellata | Stem | 2.0 | 25.0 | -0.5 | * |
| Quercus rubra | Stem | 3.0 | 66.0 | 2.5 | * |
| Quercus alba | Stem | 2.0 | 38.0 | 0.5 | * |
| Quercus rubra | Seed | -- | 18.0 | -0.3 | * |
| Quercus velutina | Stem | 2.0 | 31.0 | -0.0 | * |
| Quercus phellos | Stem | 1.0 | 21.0 | -0.7 | * |
| Raphanus sativus | Root | 0.6 | 64.0 | 1.5 | * |
| Rheum rhabarbarum | Pt | 0.1 | 36.0 | * | |
| Rhizophora mangle | Leaf | -- | 83.0 | 0.6 | * |
| Rhus copallina | Leaf | 3.0 | 67.0 | 0.2 | * |