Data Views Total Plants: 2 CSV Excel PDF Total Activities: 1 Click on column headings to sort table by that column Plant Part All Bark Seed Low PPM High PPM StdDev *Reference Marsdenia reichenbachii Bark 10000.0 20000.0 * Asclepias syriaca Seed -- -- * *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.