| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Citrullus colocynthis | Plant | -- | -- | * | |
| Citrus limon | Leaf Essent. Oil | -- | -- | Jim Duke's personal files. | |
| Elettaria cardamomum | Fruit | -- | -- | Duke, J. A. and duCellier, J. L. 1993. CRC Handbook of Alternative Cash Crops. CRC Press. Boca Raton, FL 33431. 536 pp. US $312.50. | |
| Ocimum canum | Shoot | -- | -- | =ICMR(Indian Council of Medical Research).1976.Medicinal Plants of India.Vol.1.Indian Council of Med. Res.Cambridge Printing Works, New Delhi.487 pp;ICMR.1987.Medicinal Plants of India.Vol.2.Indian Council of Med. Res.Cambr. Printing Works,New Delhi.600pp | |
| Citrus limon | Essential Oil | -- | -- | * |