What do you mean by a complete and incomplete flower?
The flower is a reproductive organ of the angiospermic plant. A typical flower consists of sepals, petals, stamens, and carpels in distinct whorls normally known as calyx, corolla, androecium, and gynoecium.
A flower in which all the four above mentioned whorls are present is called as a complete flower. A flower in which any one or more whorls are absent is called as an incomplete flower.