DAY-LENGTH AS RELATED TO VEGETATIVE DEVELOPMENT IN ULEX EUROPAEUS L.

II. ECOTYPIC VARIATION WITH LATITUDE

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Summary

The extent of the juvenile phase in gorse seedlings grown under uniform conditions from seed collected from various stations throughout Britain, has been shown to vary significantly with the latitude of the parent plants. Regular seasonal variation in the juvenile-adult balance of seedlings has also been demonstrated. Day-length seems to be the only environmental factor which can be postulated to explain such variations—for it alone changes consistently with latitude and from season to season.

Ancillary