THE EASY FOR STUDENT...........
1) These flowers are usually small and inconpicuous.
2)These flower lack nectar and have no fragnance.
3) Their anthers are large and borne on long stalks.
4) The stigmas of these flowers are long and broad ,to catch the pollen grain easily.
5) Pollen is small in size easily transported by the wind.Some pollen has wings e.g. in Pinus plant.
6) Most of these flowers are unisexual.
**Examples are Conifers, grasses, cereals, poplar, oak, walnut etc