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Total Plants: 498
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Plant Low PPM High PPM StdDev *Reference
Plantago asiatica Plant -- 31.0 -0.2 *
Broussonetia papyrifera Fruit -- 23.0 -0.2 *
Xanthosoma sagittifolium Root 5.0 19.0 -0.2 *
Manihot esculenta Root 4.0 19.0 -0.2 *
Urtica dioica Root -- 19.0 -0.2 *
Juglans cinerea Seed 26.0 37.0 -0.2 *
Prunus dulcis Seed 26.0 37.0 -0.2 *
Mentha arvensis var. piperascens Plant -- 28.0 -0.2 Suziki, A., Morimoto, I., and Okitzu, T., Elution of Metals from Crude Drugs, Shoykugaku Zasshi 36(3):190-195.
Geranium thunbergii Plant -- 28.0 -0.2 *
Lycopodium clavatum Plant -- 28.0 -0.2 Chen, H.C. and Lin, S.M. 1988. Determination of Mineral Elements in Certain Crude Drugs (Part 1), Kaohsiung J. Med. Sci., 4: 259-272.
Schizonepeta tenuifolia Plant -- 28.0 -0.2 *
Quisqualis indica Fruit -- 22.0 -0.2 *
Citrus paradisi Fruit -- 22.0 -0.2 *
Apium graveolens Leaf 1.0 44.0 -0.3 USDA's Ag Handbook 8 and sequelae)
Tephrosia candida Plant -- 26.0 -0.3 *
Stevia rebaudiana Plant -- 26.0 -0.3 Kinghorn, A. D. (Ed.) 2002. Medicinal and Aromatic Plants - Industrial Profiles. Stevia. The genus Stevia. Taylor & Francis. New York, NY. 211 pp.
Rhizophora mangle Leaf -- 43.0 -0.3 *
Lophatherum gracile Plant -- 25.0 -0.3 *
Scutellaria baicalensis Root 17.0 18.0 -0.3 *
Gentiana scabra Root -- 18.0 -0.3 *
*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.