Structural changes in the developing fruit wall of Amelanchier alnifolia

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Abstract
The flower of A. alnifolia Nutt. (Maloideae) exhibits a polyandric androecium and a syncarpous, pentalocular, inferior ovary. Each of the 5 locules contains 2 ovules. The vascular system of the floral tube is composed of 10 major bundles in addition to numerous, secondary branches. Carpel vasculature consists of 1 dorsal and 2 ventral bundles with secondary traces in addition to an ovular trace from each ventral bundle. Although there is no core line, the approximate boundary between what has been interpreteed as floral tube and carpel may be discerned. Numerous mitoses, substantial increases in cell diameters, and intercellular space formation contribute to the ultimate size and shape of the mature fruit. Fruits are mature approximately 38 days after petal drop. The mature fruit does not exhibit an extensive sclerenchymatous endocarp and, therefore, it differs from the more typical pomaceous fruits.

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