Flowering pattern and fruit production in the dioecious shrub Oemleria cerasiformis (Rosaceae)

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Abstract
Male plants of Oemleria cerasiformis have a larger flower display and a longer flowering period than females, and tend to show greater phenological variability. Male inflorescences generally begin to flower sooner than females, but reach their peak and finish flowering later. Their longer blooming period is mainly the result of less synchronous flower opening in males. In both sexes flowering tends to be completed more rapidly in later inflorescences. Fruit set in females is positively correlated with time of flowering (r = 0.313) and inflorescence size (r = 0.421). Hand-pollination of female flowers increased fruit set in most inflorescences, indicating that reproductive success in female O. cerasiformis may be pollen limited.