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Total Plants: 658
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Plant Low PPM High PPM StdDev *Reference
Ricinus communis Seed 51000.0 56000.0 -0.7 Duke, J. A. Writeups or information summaries on approximately 2,000 economic plants, USDA, ARS, Beltsville, MD 20705.
Robinia pseudoacacia Seed 103000.0 115000.0 -0.4 *
Rollinia mucosa Fruit -- 772000.0 0.0 Morton, J.F., Major Medicinal Plants. 1977. Atlas of Medicinal Plants of Middle America. Bahamas to Yucatan. 1981.
Rosa canina Fruit -- 813000.0 0.2 *
Rosmarinus officinalis Plant 77900.0 677700.0 -0.4 USDA's Ag Handbook 8 and sequelae)
Rubus chamaemorus Fruit -- 840000.0 0.3 *
Rubus idaeus Fruit -- 865700.0 0.4 Revised USDA data received 1993.
Rubus idaeus Leaf -- 831000.0 0.1 *
Rumex crispus Leaf -- 926000.0 0.6 List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979.
Rumex acetosa Leaf -- 900000.0 0.5 *
Rumex crispus Root -- 743000.0 -0.2 *
Ruscus aculeatus Root -- 698000.0 -0.5 *
Ruscus aculeatus Plant -- 698000.0 -0.3 Pedersen, M. 1987. Nutritional Herbology. Pederson Publishing. Bountiful, Utah. 377 pp.
Salix alba Bark -- 832000.0 0.6 *
Salvia officinalis Leaf -- 843000.0 0.2 *
Sambucus nigra Fruit 791000.0 821600.0 0.2 *
Santalum acuminatum Fruit -- 767000.0 -0.0 *
Schisandra chinensis Fruit -- 913000.0 0.6 Pedersen, M. 1987. Nutritional Herbology. Pederson Publishing. Bountiful, Utah. 377 pp.
Sclerocarya caffra Seed -- 39000.0 -0.7 *
Sclerocarya caffra Fruit -- 917000.0 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.