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Total Plants: 703
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Plant Low PPM High PPM StdDev *Reference
Raphanus sativus Root 160.0 5850.0 0.4 *
Raphanus sativus Leaf 300.0 2609.0 -0.4 *
Rauvolfia serpentina Seed 700.0 2200.0 -0.8 *
Rheum rhabarbarum Pt 100.0 3462.0 -0.4 *
Rheum rhabarbarum Leaf 160.0 3472.0 -0.3 *
Rhizophora mangle Leaf -- 1400.0 -0.7 *
Rhodymenia palmata Plant -- 3860.0 0.1 *
Rhus copallina Leaf 243.0 3456.0 -0.3 *
Rhus glabra Stem 126.0 2412.0 -0.1 *
Rhus copallina Stem 75.0 1464.0 -0.8 *
Rhynchosia minima Shoot -- 2400.0 -0.4 *
Ribes uva-crispa Fruit 150.0 2665.0 -0.2 *
Ribes rubrum Fruit 418.0 3310.0 0.0 *
Ribes nigrum Fruit 490.0 3500.0 0.1 *
Ricinus communis Leaf -- 4600.0 -0.1 Duke, J. A. Writeups or information summaries on approximately 2,000 economic plants, USDA, ARS, Beltsville, MD 20705.
Robinia pseudoacacia Leaf 2600.0 3200.0 -0.3 *
Rollinia mucosa Fruit 260.0 1140.0 -0.6 Morton, J.F., Major Medicinal Plants. 1977. Atlas of Medicinal Plants of Middle America. Bahamas to Yucatan. 1981.
Rosa canina Fruit 479.0 2560.0 -0.2 *
Rosmarinus officinalis Plant 490.0 2050.0 -0.7 USDA's Ag Handbook 8 and sequelae)
Rubus idaeus Leaf 395.0 2340.0 -0.5 *
*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.