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Total Plants: 538
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Plant Low PPM High PPM StdDev *Reference
Quercus rubra Seed -- 500.0 -1.0 *
Quercus alba Bark 37.0 160.0 -1.1 *
Quercus stellata Stem 175.0 5880.0 0.5 *
Quercus phellos Stem 210.0 2940.0 -0.8 *
Quercus rubra Stem 200.0 8580.0 1.6 *
Quercus alba Stem 100.0 5320.0 0.2 *
Quisqualis indica Fruit -- 1040.0 -0.5 *
Raphanus sativus Root 85.0 3570.0 0.5 *
Raphanus sativus Seed -- 3960.0 0.4 *
Rehmannia glutinosa Root -- 1190.0 -0.7 *
Rheum rhabarbarum Pt 90.0 1975.0 -1.0 *
Rheum palmatum Rhizome 1980.0 2560.0 0.9 *
Rhizophora mangle Leaf -- 8800.0 1.8 *
Rhodymenia palmata Plant -- 5930.0 0.6 *
Rhus glabra Stem 147.0 4690.0 -0.0 *
Rhus copallina Stem 375.0 4270.0 -0.2 *
Rhus copallina Leaf 405.0 9600.0 2.1 *
Ribes rubrum Fruit 122.0 935.0 -0.6 *
Ribes nigrum Fruit 220.0 1720.0 -0.2 *
Ribes uva-crispa Fruit 86.0 938.0 -0.6 *
*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.