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Total Plants: 2
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Plant Low PPM High PPM StdDev *Reference
Echinacea spp Root -- -- Economic & Medicinal Plant Research, 5: 253.
Echinacea angustifolia Root -- 3.0 Jim Duke's personal files.
*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.