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Total Plants: 490
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Plant Low PPM High PPM StdDev *Reference
Dendrobium nobile Stem -- 53.0 -1.2 *
Chamaemelum nobile Flower -- 52.0 -0.2 *
Brassica oleracea var. sabellica l. Leaf 8.0 50.0 -0.4 *
Viburnum opulus Bark -- 49.0 -0.3 Pedersen, M. 1987. Nutritional Herbology. Pederson Publishing. Bountiful, Utah. 377 pp.
Geranium thunbergii Plant -- 49.0 -0.3 *
Brassica oleracea var. botrytis l. Flower 1.5 48.0 -0.2 *
Origanum vulgare Plant -- 47.0 -0.4 USDA's Ag Handbook 8 and sequelae)
Juglans nigra Seed 30.0 46.0 -0.1 *
Pinellia ternata Tuber 11.0 46.0 -0.2 *
Rheum palmatum Rhizome 19.0 46.0 -0.5 *
Phoenix dactylifera Fruit 3.0 45.0 -0.1 *
Colocasia esculenta Leaf -- 45.0 -0.4 *
Brassica oleracea var. capitata l. Leaf 1.0 45.0 -0.4 *
Mentha arvensis var. piperascens Plant -- 44.0 -0.4 Suziki, A., Morimoto, I., and Okitzu, T., Elution of Metals from Crude Drugs, Shoykugaku Zasshi 36(3):190-195.
Castanea dentata Seed 19.0 44.0 -0.1 *
Psophocarpus tetragonolobus Seed 34.0 44.0 -0.1 *
Panax japonicus Rhizome -- 43.0 -0.6 *
Tetrapanax papyrifera Pith -- 43.0 -1.0 *
Sophora angustifolia Root 28.0 42.0 -0.0 *
Magnolia denudata Flower -- 42.0 -0.2 *
*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.