What is the purpose for leaves on flowers?

A leaf is an above-ground plant organ specialized for photosynthesis. Leaves are also the sites in most plants where transpiration and guttation take place. Leaves can store food and water, and are modified in some plants for other purposes. Furthermore, leaves are prominent in the human diet as leaf vegetables. ______________________________________________________________________ Leaves absorb sunlight, thus promoting photosynthesis which produces the green colour, keeps the plant alive and incidentally - though not importantly to the plant - helps keep local humans fed and supplied with timber and stockfeed, which may or may not be a good thing for the plant. They also assist in absorbing rainfall, which reaches them before filtering through to the roots of the plant. This is important for flowering and fruiting and general growth. They attract arborial creatures, including insects and birds, which assist in fertilization, and particularly with trees, especially deciduous species, cover the ground beneath them with a coating of mulch which holds in moisture and protects and feeds the tree, especially in times of drought or during winter seasons. ______________________________________________________________________