Data Views Total Plants: 21 CSV Excel PDF , Previous12 Show all rows. Paginate rows. Click on column headings to sort table by that column Plant Part All Fruit Leaf Plant Root Shoot Low PPM High PPM StdDev *Reference Pycnanthemum loomisii Shoot 33.0 42.0 -1.0 Lawrence, B.M., Essential Oils 1976-1977, Essential Oils 1978, Essential Oils 1979-1980. *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.