Thebaine content of selections of Papaver bracteatum Lindl. at different ages.
Approximately 200 accessions of Papaver species were evaluated for identification as P. bracteatum Lindl. and for thebaine content. Fifteen authentic P. bracteatum accessions were selected on the basis of chromosome count. Statistical analyses of variation in alkaloid content were made for these accessions. Four of the 15 warranted further study based on the vigor of the plant and the total thebaine present in the tissue. Significant variability in thebaine content was found in wild strains of P. bracteatum, thus requiring genetic selection studies. The data showed that total yield potential of thebain should be considered in selecting P. bracteatum strains for commercial growth rather than concentrating on strains that produce the highest thebaine concentrations. A method for the quantitative estimation of thebaine from P. bracteatum is presented.