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Total Plants: 498
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Plant Low PPM High PPM StdDev *Reference
Arctium lappa Root 0.5 2.2 -1.0 *
Ruscus aculeatus Root 0.6 2.1 -1.0 *
Tragopogon porrifolius Root -- 2.0 -1.0 *
Harpagophytum procumbens Root 0.3 1.8 -1.0 *
Hydrastis canadensis Root 0.4 1.6 -1.0 *
Castanea sativa Seed 4.0 10.0 -1.0 *
Yucca baccata Root 0.3 1.4 -1.0 *
Juncus effusus Pith -- 38.0 -1.0 *
Taraxacum officinale Root 0.2 1.3 -1.0 *
Quercus alba Bark 0.6 2.4 -1.0 *
Salix alba Bark 0.4 2.1 -1.0 *
Glycyrrhiza glabra Root 0.1 0.3 -1.0 *
Ginkgo biloba Seed 3.0 8.0 -1.1 USDA's Ag Handbook 8 and sequelae)
Morus alba Root Bark 9.0 14.0 -1.1 *
Tabebuia heptaphylla Bark 0.1 0.7 -1.2 *
Plantago major Seed 0.8 2.5 -1.2 *
Plantago psyllium Seed 0.5 2.1 -1.2 *
Phaseolus coccineus Seed -- 2.0 -1.2 *
Foeniculum vulgare Seed 0.1 0.7 -1.3 *
Dendrobium nobile Stem -- 26.0 -1.3 *
*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.