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 Bark Essential Oil Flower Fruit Essent. Oil Leaf Essent. Oil Plant Root Seed Seed Essent. Oil Shoot Low PPM High PPM StdDev *Reference Thymus vulgaris Essential Oil -- -- * *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.