To determine the relative importance of variation in several plant characters on susceptibility to herbivores, we examined patterns of seed predation by two monophagous insect species and patterns of ...

1. The upper seeds of Xanthium show constantly less catalase activity per unit of dry substance than the lower seeds. 2. Catalase activity is relatively stable in dry stored seeds, for several months.

A PROCEDURE for the preparation of a floral initiating extract from the leaf tissues of Xanthium strumarium has been described in an earlier report1. In general, the procedure involves the rapid ...

China: seeds ground into flour and baked into cakes. Young leafy shoots thoroughly boiled and washed to remove bitter element, possibly tannin, as the plant is an active styptic. Manchuria: leaves ...

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