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Total Plants: 116
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Plant Low PPM High PPM StdDev *Reference
Quercus rubra Stem 1.4 17.0 -1.1 *
Quercus alba Stem 0.2 76.0 0.1 *
Quercus velutina Stem 1.5 31.0 -0.8 *
Quercus rubra Seed -- 0.01 -0.7 *
Quercus stellata Stem 0.7 59.0 -0.2 *
Raphanus sativus Root 0.01 0.57 -0.6 *
Rheum rhabarbarum Pt 0.02 1.0 *
Rhodymenia palmata Plant -- 3.5 -0.5 *
Rhus copallina Leaf 0.2 67.0 0.8 *
Rhus glabra Stem 0.4 20.0 -1.1 *
Rhus copallina Stem 0.2 92.0 0.5 *
Ribes nigrum Fruit 0.04 0.6 -0.5 ACTA AGRIC SCAND SUPPL 22: 1980
Ribes rubrum Fruit 0.02 0.5 -0.5 *
Rosa canina Fruit 0.16 0.4 -0.5 ACTA AGRIC SCAND SUPPL 22: 1980
Rubus chamaemorus Fruit 0.1 1.0 -0.4 *
Sassafras albidum Leaf 1.0 34.0 0.1 *
Sassafras albidum Stem 0.1 37.0 -0.7 *
Solanum tuberosum Tuber 0.01 4.2 *
Solanum melongena Fruit 1.4 1.6 -0.4 *
Sorbus aucubaria Fruit 0.1 3.0 -0.3 *
*Unless otherwise noted all references are to Duke, James A. 1992. Handbook of phytochemical constituents of GRAS herbs and other economic plants. Boca Raton, FL. CRC Press.