Data Views Total Plants: 1 CSV Excel PDF Click on column headings to sort table by that column Plant Part Low PPM High PPM StdDev *Reference Holarrhena pubescens Bark -- 2.2 Siddiqui, B. S., Usmani, S. B., Begum, S., Siddiqui, S. 1994. Steroidal Constituents of Holarrhena pubescens. J. Natural Products, 57(1): 27-31. *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.