Chemistry of toxic range plants. Variation in pyrrolizidine alkaloid content of Senecio, Amsinckia, and Crotalaria species
1985
Johnson, A.E. | Molyneux, R.J. | Merrill, G.B.
The free base and N-oxide pyrrolizidine alkaloid contents of a number of Senecio, Amsinckia, and Crotalaria species, which occur as range plants in the United States, have been measured in order to study variations with season, location, and species. Sampling on a monthly basis during the growing season, carried out for a 3-year period, showed considerable inter- and intraspecies variation in alkaloid content. In most species the total alkaloid content reached a maximum at the preflower or early bud stage.
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