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Total Plants: 185

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Plant	Part	Low PPM	High PPM	StdDev	^*Reference
Vitis vinifera	Stem	--	365.0	-0.5	Pedersen, M. 1987. Nutritional Herbology. Pederson Publishing. Bountiful, Utah. 377 pp.
Yucca baccata	Root	0.3	1.2	-0.3	*
Zea mays	Silk Stigma Style	--	237.0		*
Zingiber officinale	Rhizome	--	285.0		*
Zingiber officinale	Root	2.0	28.5	-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.