Abstract
A study has been made of the relationship between the content of coumarin and its related compounds in the leaves of Anthoxanthum species. In the two species A. puelii and A. amarum, which headed without low‐temperature or short‐day induction, successive mature leaves on the main shoot were studied: they showed a general increase in the content of coumarin and related compounds up to the flag leaf which had a maximum value.In A. odoratum, which was non‐heading when grown under the same experimental conditions, the distribution of coumarin and related compounds was examined during the life of individual leaves from emergence to senescence. Each leaf showed a similar basic pattern: a peak value for coumarin occurred at maturity, which coincided with an initial peak value for related compounds. With senescence the coumarin value in each leaf fell, but the related compounds, after an initial fall, now increased in concentration and attained a maximum at senescence.
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