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Abstract
A harmonic model, consisting of growth and seasonal components, accounted for 80% of the variation in flower production of Strelitzia reginae Ait. (bird of paradise). Time series analyses showed low temperatures to be most closely associated with flower production. A model of flower stalk development indicated the mechanism of seasonal flower production in the increasing phase of the model, low temperature (14° to 16°C) retarded floral differentiation and subsequent elongation prior to flower emergence. A temperature threshold of 27° was the source of seasonal flower production in the decreasing phase of the model by causing flower bud abortion.