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Total Plants: 263
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Plant Low PPM High PPM StdDev *Reference
Rheum officinale Plant -- 13000.0 -0.5 *
Rheum officinale Root -- -- Leung, A.Y., Encyclopedia of Common Natural Ingredients Used in Food, Drugs, and Cosmetics, John Wiley & Sons, New York, 1980.
Ribes nigrum Fruit -- -- *
Ribes nigrum Fruit Juice -- -- *
Ribes nigrum Leaf -- -- *
Ricinus communis Leaf -- 2000.0 -0.9 *
Rosa multiflora Fruit -- -- *
Rubus idaeus Plant -- -- Newall, C. A., Anderson, L. A. and Phillipson, J. D. 1996. Herbal Medicine - A Guide for Health-care Professionals. The Pharmaceutical Press, London. 296pp.
Rumex crispus Leaf -- -- *
Rumex acetosella Shoot -- 5300.0 -0.2 *
Rumex acetosa Leaf -- 12800.0 -0.2 *
Ruscus aculeatus Root 91.0 400.0 *
Ruscus aculeatus Plant 300.0 400.0 -0.7 Pedersen, M. 1987. Nutritional Herbology. Pederson Publishing. Bountiful, Utah. 377 pp.
Ruscus aculeatus Shoot -- -- *
Ruta graveolens Plant -- 20000.0 -0.4 *
Salix alba Leaf -- -- *
Salix alba Bark -- -- Pedersen, M. 1987. Nutritional Herbology. Pederson Publishing. Bountiful, Utah. 377 pp.
Sambucus nigra Flower 19000.0 25000.0 -0.4 *
Sambucus canadensis Leaf 35000.0 38000.0 1.4 *
Sambucus canadensis Flower 7700.0 52000.0 0.0 *
*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.