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| Chemical Name | Dosage | Reference |
|---|---|---|
| THUJONE | not available | J. Ess. Oil Res. 7: 271. |
| THYMOHYDROQUINONE | MIC=6.25-100 ug/ml | Duke, 1992 * |
| THYMOL | MIC=50-400 ug/ml | Duke, 1992 * |
| THYMOQUINONE | not available | Farnsworth, N.R. and Cordell, G.A. A Review of Some Biologically Active Compounds Isolated From Plants as Reported in the 1974-1975 Literature. J. Nat. Prod. 39: 420, 1976. |
| TIN | not available | Duke, 1992 * |
| TOMATINE | not available | Duke, 1992 * |
| TRACHINODIOL-7-BETA-ACETATE | not available | Duke, 1992 * |
| TRACHINODIOL-DIACETATE | not available | Duke, 1992 * |
| TRACHINOL | not available | Duke, 1992 * |
| TRANS-ASARONE | not available | Duke, 1992 * |
| TRANS-ISOASARONE | not available | Duke, 1992 * |
| TRICROZARIN | not available | Duke, 1992 * |
| TROPOLONE | not available | Duke, 1992 * |
| TUBEROSIN | 250 u/ml | Wagner & Wolff, eds. 1977. New Natural Products (RS164. I56. 176) |
| ULIGINOSIN | not available | Duke, 1992 * |
| UMBELLIFERONE | not available | Jeffery B. Harborne and H. Baxter, eds. 1983. Phytochemical Dictionary. A Handbook of Bioactive Compounds from Plants. Taylor & Frost, London. 791 pp. |
| URESIN | not available | Duke, 1992 * |
| URSOLIC-ACID | not available | Duke, 1992 * |
| VANILLIC-ACID | 1.5-15 mg/ml | Recio, M. C., Rios, J. L., and Villar, A., A review of some antimicrobial compounds isolated from medicinal plants reported in the literature 1978-1988, Phytotherapy Research, 3(4), 1989, 117-125. |
| VERBASCOSIDE | not available | Duke, 1992 * |
| Plant Name | Common Name | Chemical Count | Total Parts Per Million |
|---|---|---|---|
| Rhododendron falconeri | not available | 1 | 0 |
| Rhododendron ferrugineum | Rusty-Leaved Alpenrose | 4 | 0 |
| Rhododendron grande | not available | 1 | 0 |
| Rhododendron ponticum | Pontic Alpenrose | 10 | 120, 000 |
| Rhodomyrtus tomentosa | not available | 1 | 6 |
| Rhodymenia palmata | Dulse | 2 | 153 |
| Rhus coriaria | Sicilian Sumac; Sumac; Tanner's Sumac | 9 | 840, 000 |
| Rhus glabra | Smooth Sumac | 2 | 270, 006 |
| Rhus toxicodendron | Poison Ivy | 3 | 0 |
| Rhynchosia minima | Burn Mouth Vine | 2 | 0 |
| Ribes nigrum | Black Currant | 37 | 164, 114 |
| Ribes rubrum | Red Currant; White Currant | 8 | 68, 528 |
| Ribes uva-crispa | Gooseberry | 10 | 19, 379 |
| Ricinus communis | Castorbean | 13 | 2, 380 |
| Robinia pseudoacacia | Black Locust | 12 | 326, 000 |
| Rollinia mucosa | Biriba; Lancewood | 1 | 2, 900 |
| Rosa canina | Rose; Dogbrier; Dog Rose | 21 | 774, 105 |
| Rosa centifolia | Cabbage Rose | 11 | 1, 200 |
| Rosa damascena | Damask Rose | 20 | 15, 000 |
| Rosa davurica | not available | 1 | 70 |