female flowers of Humulus lupulus
Hops are the flowers of the hop plant, which are in the humulus genus. Hops look like little cones, and are used to make beer. They give the beer a bitter flavor. They have been used to make beer for many centuries, and were used by the Romans in the Roman Empire. 
|Common Hop plant (Humulus lupulus)|
Humulus lupulus L.
- ↑ "A History of Hops". Archived from the original on 2010-03-11. Retrieved 2010-03-06.