Data Views Total Plants: 2 CSV Excel PDF Total Activities: 1 Click on column headings to sort table by that column Plant Part All Root Shoot Low PPM High PPM StdDev *Reference Piper methysticum Root -- 40.0 * Leptospermum scoparium Shoot -- -- * *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.