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Total Plants: 186
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Plant Low PPM High PPM StdDev *Reference
Colocasia esculenta Leaf -- 3.6 -1.6 *
Cinnamomum verum Bark 7.0 15.0 Betting on Boron, Unpublished draft by J. A. Duke on file at USDA, draft and papers relating to boron percentages. Includes Internat. Z. Vit. Ern. Forschung 43:1973 (boron).
Zingiber officinale Rhizome 1.0 4.0 *
Solanum tuberosum Tuber 1.0 8.0 *
Acacia catechu Plant -- -- *
Rheum rhabarbarum Pt 0.1 36.0 *
*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.