Ahtanum Hops are a hop variety to be used for the typical American hop aroma and flavor.  Very citrusy and floral, it is a fine alternative to Cascade or Amarillo.  From what I read, Ahtanum hops have less bitterness than Cascade so that might be something to keep in mind when crafting up a recipe…or altering an existing recipe. 

Origin: USA -Yakima Chief Ranches

Aroma: Similar to Cascade or Amarillo – Citrus (Grapefruit) and Floral.  Some woodsy, earthy notes too.

Alpha Acid: Usually between 5.7-6.3%

Typical Usage: Aroma for the most part.  Some texts had it as a moderate bittering hop too.

Beer Styles: Pales, IPA, and a nice American Brown.

While you are here, check out other popular Brew Dudes hop profiles:
Willamette Hops
Galena Hops
Northern Brewer Hops