Even without any specialized knowledge of botany or plants, anybody should be able to identify flowers from a distance. They are distinctive because of their bright colors and sweet scent. While their biological purpose is to ensure the plant keeps living and functioning as the reproductive structures, humans have many other uses for them.
As has been mentioned before their look is quite familiar and easy to recognize; they are characterized by a collection of bright petals encircling a stigma. While this is norm it is definitely not a universal rule. There are some blooms that look so exotic that they are not identifiable as flowers at first sight. The litmus test is to ask if the part of the plant you are referring to has reproductive capabilities, if the answer is yes then it qualifies as a flower of sorts.
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