Data Views Total Plants: 2 CSV Excel PDF Click on column headings to sort table by that column Plant Part All Plant Shoot Low PPM High PPM StdDev *Reference Melissa officinalis Plant 2.6 80.0 * Melissa officinalis Shoot -- -- Abstract (See species file) *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.