Anemophily or wind pollination is a form of pollination whereby pollen is distributed by wind. Anemophilous plants may be either gymnosperms (non-flowering) or angiosperms (flower-producing). However, flowering anemophilous species do not develop scented flowers, nor do they produce nectar. This distinguishes them from entomophilous and zoophilous species (whose pollen is spread by insects and vertebrates respectively).