1. Senecio bupleuroides contains the same two alkaloids as Senecio
retrorsus and Senecio isatideus, viz. retrorsine and isatidine.
2. The quantities of these alkaloids extractable from the dried plant,
collected in the post-seeding stage, are: retrorsine, 0•16 per cent.; isatidine,
0•7 per cent.
3. The plant is of low toxicity compared with Senecio retrorsus and
isatideus. A negative result was obtained in a physiological test.
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