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Total Plants: 394
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Plant Low PPM High PPM StdDev *Reference
Robinia pseudoacacia Flower -- -- *
Ribes nigrum Fruit -- -- List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979.
Rheum palmatum Rhizome -- 2.0 -1.1 *
Pycnanthemum tenuifolium Shoot 28.0 280.0 0.0 Lawrence, B.M., Essential Oils 1976-1977, Essential Oils 1978, Essential Oils 1979-1980.
Pycnanthemum pilosum Flower 28.0 105.0 -0.2 Lawrence, B.M., Essential Oils 1976-1977, Essential Oils 1978, Essential Oils 1979-1980.
Pycnanthemum clinopodioides Shoot 42.0 44.0 -0.2 Lawrence, B.M., Essential Oils 1976-1977, Essential Oils 1978, Essential Oils 1979-1980.
Pycnanthemum pycnanthemoides Shoot 1.0 696.0 0.4 Lawrence, B.M., Essential Oils 1976-1977, Essential Oils 1978, Essential Oils 1979-1980.
Pycnanthemum loomisii Shoot 1452.0 1932.0 1.7 Lawrence, B.M., Essential Oils 1976-1977, Essential Oils 1978, Essential Oils 1979-1980.
Pycnanthemum californicum Shoot -- -- Lawrence, B.M., Essential Oils 1976-1977, Essential Oils 1978, Essential Oils 1979-1980.
Pycnanthemum virginianum Shoot 18.0 493.0 0.2 Lawrence, B.M., Essential Oils 1976-1977, Essential Oils 1978, Essential Oils 1979-1980.
Pycnanthemum pilosum Leaf 28.0 105.0 -0.4 Lawrence, B.M., Essential Oils 1976-1977, Essential Oils 1978, Essential Oils 1979-1980.
Pycnanthemum incanum Shoot -- -- Lawrence, B.M., Essential Oils 1976-1977, Essential Oils 1978, Essential Oils 1979-1980.
Pycnanthemum albescens Shoot 48.0 162.0 -0.1 Lawrence, B.M., Essential Oils 1976-1977, Essential Oils 1978, Essential Oils 1979-1980.
Psidium guajava Pericarp Essent. Oil -- -- *
Prunus armeniaca Essential Oil -- -- *
Piper cubeba Fruit -- -- Lawrence, B.M., Essential Oils 1976-1977, Essential Oils 1978, Essential Oils 1979-1980.
Piper nigrum Fruit Essent. Oil -- 1000.0 -0.9 *
Piper nigrum Fruit -- -- *
Pinus sylvestris Leaf Essent. Oil 6500.0 167000.0 2.5 *
Pimpinella anisum Seed -- 1.0 -0.5 *
*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.