DATE OF FLOWERING AS AFFECTED BY CLIMATIC TEMPERATURE

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Abstract
The date of flowering of members of the genera Rhododendron, Cytisus, and Syringa is found to be influenced by the climatic temp. in certain significant belts of time. In Rhododendron there is a distal belt about 1 month after the previous year''s flowering, and a proximal belt in the spring of the year of flowering. According to whether temp. is high or low at these times, flowering is early or late. The flowering of Cytisus is influenced only by a proximal temp.belt (March). For Syringa also there is no distal belt, and the influence of the proximal belt is considerably modified by the effect of temp.immediately prior to flowering, called the immediate temp. belt. The comparatively narrow belts of time during which deviations of temp.appear to affect time of flowering are believed to synchronize with activity in spore formation in the plant. This work is based on the records of flowering dates kept at the Royal Botanic Garden, Edinburgh (unpublished). The temp.records are those taken at Edinburgh University and published in the monthly weather reports of the Meteorological Office, and the daily temp.records kept at the Royal Botanic Garden, Edinburgh (unpublished).

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