For 10 points, name this structure found in angiosperm plants, often surrounded by petals.
Darwin predicted the existence of a Madagascar moth after observing one of these structures, which have separate male/female types in dioecious [dy-oh-EE-shus] species. The parts of this occur in multiples of three in monocots and many use (*) nectar to attract pollinators. One mature part of this becomes the fruit, and it has stamen and carpel reproductive organs. For 10 points, name this structure found in angiosperm plants, often surrounded by petals.
Darwin predicted the existence of a Madagascar moth after observing one of these structures, which have separate male/female types in dioecious [dy-oh-EE-shus] species.
{flower} [do not prompt on \"plant\"]