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In most flowering plants, a single cytokinesis follows the two meiotic divisions during pollen-grain ontogeny. Aperture pattern (i.e., aperture number and distribution on pollen surface) ontogeny(More)
We examined large-scale patterns of morphology, genetic structure and ecological correlates of Fraxinus excelsior and the closely related species Fraxinus angustifolia in France, in order to(More)