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Total Plants: 841
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Plant Low PPM High PPM StdDev *Reference
Rhizophora mangle Leaf -- 13500.0 -0.3 *
Rhodymenia palmata Plant -- 6320.0 -0.8 *
Rhus glabra Stem 2520.0 24790.0 0.7 *
Rhus copallina Stem 2450.0 21350.0 0.3 *
Rhus copallina Leaf 3240.0 24960.0 0.4 *
Rhynchosia minima Shoot -- 19200.0 0.3 *
Ribes nigrum Fruit 502.0 4720.0 0.2 *
Ribes uva-crispa Fruit 185.0 4122.0 0.1 *
Ribes rubrum Fruit 298.0 2875.0 -0.2 *
Ricinus communis Leaf -- 26700.0 0.6 Duke, J. A. Writeups or information summaries on approximately 2,000 economic plants, USDA, ARS, Beltsville, MD 20705.
Robinia pseudoacacia Seed -- 19000.0 2.7 *
Robinia pseudoacacia Leaf 12900.0 15000.0 -0.2 *
Rollinia mucosa Fruit 240.0 1050.0 -0.6 Morton, J.F., Major Medicinal Plants. 1977. Atlas of Medicinal Plants of Middle America. Bahamas to Yucatan. 1981.
Rosa canina Fruit 1515.0 8100.0 1.0 *
Rosa laevigata Fruit -- 7620.0 0.9 *
Rosmarinus officinalis Plant 3170.0 16150.0 0.3 USDA's Ag Handbook 8 and sequelae)
Rubia cordifolia Root -- 37800.0 3.3 *
Rubus idaeus Leaf 2045.0 12100.0 -0.4 *
Rubus chingii Fruit -- 7490.0 0.8 *
Rubus idaeus Fruit 220.0 1645.0 -0.5 Revised USDA data received 1993.
*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.