Think Hallertau Hops and think Bavarian beers styles. The Hallertau variety once dominated the region from which it was named before being replaced by a Hersbrucker and other hallertau varieties which or more tolerant of wilt.
Hallertau Hops has a very long history in German Lagers and its aromatic and flavor properties help to describe generations of beers from the area. Hallertau is an aromatic hops with an alpha acid rating at 3.5%-5.5%. This variety is considered a noble hops. This designation fits Tettnanger, Spalt, and Saaz as well, and refers to their high amounts of humulene, and low amounts of alpha acids. Also these varieties have high aromatic qualities. Hallertau itself has tempered yet spicy aroma. It is useful any time during the brewing process from kettle additions, but is more favorable for late additions or during dry hop.